beancounter - Stock portfolio performance monitor tool

beancounter [options] command [command_arguments ...]

 addindex index args       add stock(s) to market index 'indx'
 addportfolio sym:nb:fx:type:o:pp:pd ... 
                           add 'nb' stocks of company with symbol 'sym'
                           that are listed in currency 'fx' to the 
                           portfolio with optional 'type' and 'owner'
                           info, purchase price 'pp' and date 'pd'; 
                           see below for a complete example
 allreports                combines dayendreport, status and risk 
 addstock arg ...          add stock(s) with symbol arg to the database
 advancement               report on unrealized gains from lows
 backpopulate  arg ...     fill with historic data for given stock(s)
 checkdbconnection         test if connection to db can be established
 dailyjob                  combines update, dayendreport, status + risk 
 dayendreport              reports p/l changes relative to previous day
 deactivate symbol ...     set stock(s) inactive in stockinfo table
 delete arg ...            delete given stock(s) from database
 destroydb                 delete the BeanCounter database
 fxbackpopulate  arg ...   fill with historic data for currency(ies)
 lsportfolio               list portfolio data
 plreport                  run an portfolio p/l report rel. to any day
 quote arg ...             report current data for given stock(s)
 retracement               report unrealized losses from highs (drawdowns)
 risk                      display a portfolio risk report
 split arg ...             split-adjust price history and portfolio
 status                    status summary report for portfolio
 update                    update the database with day's data
 warranty                  display the short GNU GPL statement

 --help                    show this help
 --verbose                 more verbose operation, debugging
 --date date               report for this date (today)
 --prevdate date           relative to this date (yesterday)
 --currency fx             set home currency
 --restriction sql         impose SQL restriction
 --extrafx fx1,fx2,...     additional currencies to load
 --forceupdate date        force db to store new price info with date
 --rcfile file             use different configuration file
 --[no]fxupdate            enforce/suppress FX update, default is update
 --[no]commit              enforce/suppress database update, default is commit
 --[no]equityupdate        enforce/suppress Equity update, default is update
 --[no]pacificfx           use/skip FX from UBC's Sauder school, default skip
 --splitby arg             split stock history and position by this factor [2]
 --dbsystem system         use db backend system, default is PostgreSQL
 --dbname name             use db name, default is beancounter

beancounter gathers and analyses stock market data to evaluate portfolio performance. It has several modes of operation. The first main mode is data gathering: both current data (e.g. end-of-day closing prices) and historical price data (to back-populate the database) can be retrieved both automatically and efficiently with subsequent local storage in a relational database system (either PostgreSQL, MySQL or SQLite) though any other system with an ODBC driver could be used). The second main mode is data analysis where the stored data is evaluated to provide performance information. Several canned reports types are already available.

Data is retrieved very efficiently in a single batch query per Yahoo! host from the Yahoo! Finance web sites using Finance::YahooQuote module (where version 0.18 or newer is required for proxy support). Support exists for North America (i.e. US and Canada), Europe (i.e. the Continent as well as Great Britain), several Asian stock markets, Australia and New Zealand.

beancounter can aggregate the change in value for the entire portfolio over arbitrary time horizons (provided historical data has either been gathered or has been backpopulated). Using the powerful date-parsing routine available to Perl (thanks to the Date::Manip modules), you can simply say 'from six months ago to today' (see below for examples).

beancounter has been written and tested under Linux. It should run under any standard Unix as long as the required Perl modules are installed, as as long as the database backend is found.

 beancounter update --forceupdate today

    This updates the database: it extends timeseries data (such as
    open, low, high, close, volume) with data for the current day,
    and overwrites static data (such as capital, price/earnings, ...) 
    with current data. All stocks held in the database are updated
    (unless the --restriction argument instructs otherwise). The 
    --forceupdate option lets the program corrects incorrect dates 
    returned from Yahoo! (which happens every now and so often), but
    be careful to correct for this on public holidays. Note that 
    the --restriction argument will be applied to the portfolio table,
    whereas the overall selection comes from the stockinfo table.

 beancounter addportfolio SUNW:100:USD:401k:joe:85.50:19991117 \
                          IBM:100:USD:401k:joe:90.25:20000320  \
                          SPY:50:USD:ira:joe:142.25:20000620

    This adds the two stocks Sun and IBM to the 401k portfolio of Joe,
    as well as SP500 'Spiders' to his IRA portfolio. The stocks are
    also added to the general stock info tables via an implicit call
    of the stockinfo command.

 beancounter addstock LNUX RHAT COR.TO

    This adds these three Linux companies to the database without adding
    them to any specific portfolios.

 beancounter backpopulate --prevdate '1 year ago' \
                          --date 'friday 1 week ago' IBM SUNW HWP

    This backpopulates the database with historic prices for three
    hardware companies. Note how the date specification is very general
    thanks to the underlying Date::Manip module.

 beancounter fxbackpopulate --prevdate '1 year ago' \
                          --date 'friday 1 week ago' CAD EUR GBP

    This backpopulates the database with historic prices for these
    three currencies. Note how the date specification is very general
    thanks to the underlying Date::Manip module.

    Unfortunately, Yahoo! is a little bone-headed in its implementation
    of historic FX rates -- these are stored to only two decimals 
    precision, just like stockprices. Unfortunately, convention is to
    use at least four if not six. Because of the limited information, 
    risk from FX changes will be underestimated.

 beancounter plreport --prevdate '1 month ago' --date 'today' \
                        --restriction "owner='joe'"

    This calculates portfolio profits or losses over the last month. It
    also imposes the database restriction that only stocks owned by
    'joe' are to be included.

 beancounter status --restriction "type='401k'"

    This shows a portfolio status report with the restriction that only
    stocks from the '401k' account are to be included.

 beancounter risk --prevdate "6 month ago"

    This shows a portfolio risk report. This tries describes the 
    statistically plausible loss which should be exceeded only 1 out
    of 100 times (see below for more details).

 beancounter dailyjob --forceupdate today

    Run a complete 'job': update the database, show a day-end profit/loss
    report, show a portfolio status report and show a riskreport. In the
    update mode, override a potentially wrong date supplied by Yahoo!
    with the current date.

 beancounter split --splitby 3 --prevdate 1990-01-01 ABC CDE

    Split-adjusts the (hypothetical) stocks ABC and CDE by a factor
    of three: price data in the database is divided by three, volume
    increased by 3 and similarly, in the portfolio shares are increased
    and cost is descreased.  Default dates are --prevdate and --date
    which may need adjusting.

The following few paragraphs will illustrate the use of beancounter. We will set up two fictional accounts for two brothers Bob and Bill (so that we can illustrate the 'owner' column). The prices below are completely fictitious, as are the portfolios.

We suppose that beancounter is installed and that the setup_beancounter command has been run. We can then create a two-stock (computer hardware) portfolio for Bob as follows:

 beancounter addportfolio SUNW:100:USD:401k:bob:85.50:19991117 \
                          IBM:100:USD:401k:bob:90.25:20000320

Here we specify that 100 shares each of Sun and IBM, priced in US Dollars, are in Bob's portfolio which is tagged as a 401k retirement account. The (fictitious) purchase price and date are also given.

Let's suppose that Bill prefers networking equipment, and that he has a brokerage account in Canada:

 beancounter addportfolio CSCO:100:USD:spec:bill:78.00:19990817 \
                          NT:200:CAD:spec:bill:cad:90.25:20000212

Now we can backpopulate the database from 1998 onwards for all four stocks:

 beancounter backpopulate --prevdate 19980101 CSCO IBM NT SUNW

With this historical data in place, we now compare how Bob's portfolio would have fared over the last 18 months:

 beancounter plreport --prevdate '18 months ago' \
                        --restriction "owner='bob'"

Note how we use double quotes to protect the arguments, and how the SQL restriction contains a further single quote around the literal string.

We can also review the performance for Bill at the most recent trading day:

 beancounter dayendreport --restriction "owner='bill'"

or the status of holdings and their respective values:

 beancounter dayendreport --restriction "owner='bill'"

Similarly, a risk reports can be run on this portfolios per

 beancounter risk --restriction "owner='bill'"

addportfolio is the most important 'position entry' command. As with other commands, several arguments can be given at the same time. For each of these, records are separated using a colon and specify, in order, stock symbol, number of stocks held, currency, account type, account owner, purchase price and purchase date. Only the first three arguments are required, the others are optional. Executing addportfolio implicitly executes addstock. The account type column can be used to specify whether the account is, e.g., a tax-sheltered retirement account, or it could be used to denote the brokerage company is it held at.

plreport retrieves the most recent quotes(s). This is useful for illiquid securities which might not have traded that day, or if a public holiday occurred, or if there was a data error at Yahoo!. Two dates can be specified which determine the period over which the profit or loss is computed. This will fail if price data (or currency data in the case of foreign stocks data) data is not available for either of those two dates. This may be restrictive for foreign stocks where we cannot backpopulate due to lack of public data source for historical currency quotes. Major currencies can be retrieved from Yahoo!, but only to two decimals precisions.

dayendreport is similar to plreport but is always over a one-day period. It also uses only one date record by calculating performance given the 'previous close' data.

status shows holdings amounts, total position values, annualized returns in percentages and holding periods in days. Note that the annualized returns can appear excessive if, e.g., a ten-day return from a recently purchased stock is extrapolated to an annual time period.

risk shows a portfolio risk report which describes the statistically plausible loss which should be exceeded only 1 out of 100 times. In other words, the loss estimate has a critical level of 99%. This risk level is estimated via two methods. The first is non-parametric and assumes no particular model or distribution; it computes the 1% quintile of the return distribution and displays it as well as the corresponding asset value at risk. The second method uses the standard Value-at-Risk (VaR) approach. This uses the 1% critical value of the Normal distribution and implicitly assumes a normal distribution for returns. See CWhttp://www.gloriamundi.org for more introduction and references. If the distribution of normalitty was perfectly true, both measures would coincide. A large difference between the two estimates would indicate that the return distribution might be rather non-normal. Another view of the riskiness of a given position is provided by the last column with the 'margVaR' heading. It shows the marginal Value-at-Risk. Marginal VaR is commonly defined as the risk contribution of the given position to the total portfolio, and calculated as the difference in the VaR of the full portfolio and the VaR of an otherwise identical portfolio with the given position removed. Note that calculating marginal VaR is fairly slow (on the order of O(n^3) ].

retracement shows a 'drawdown' report. Drawdown is commonly defined as the percentage loss relative to the previous high. The default period is used, but can be altered with the --date and --prevdate options. The default period is also corrected for the actual holding period. In other words, if a stock has been held for two months, only those two months are used instead of the default of six months but if the last months has been selected via --prevdate then it is used. For short positions, the analysis is inverted and relative to the previous low. The report displays each stock, the number of shares held, the current price and holdings value. The next two columns show the maximum price attained in the examined period, and the percent decline relative to it. The last column shows the unrealized loss relative to the maximum price over the period. The aggregate holdings value, percent decline and unrealized loss are shown as well.

advancement does the opposite of drawdown it computes unrealized gains relative to the minimum price in the period. The discussion in the preceding paragraph applies `but inverted'.

lsportfolio simply lists the content of the portfolio table. A SQL restriction can be imposed.

addindex adds stocks a the index table. Currently, no further analysis references this table.

addstock adds stocks to the database. From then on data will be retrieved for the given symbol(s) and stored in the database whenever the update command is executed.

backpopulate fills the database with historic prices for the given symbols and date period. Note that this works well for stocks and mutual fund. Options have no historic data stored. Currencies are stored with limited precision as noted above.

quote simply shows a price quote for the given symbol(s).

update updates the database with quotes for all stocks for the given day. No output is generated making the command suitable for cron execution.

dailyjob is a simple convenience wrapper around update, dayendreport, status and risk,

allreports is a another covenience wrapper around dayendreport, status and risk.

deactivate will set the active column in stockinfo for the given symbol(s) to false thereby inhibiting any further updates of symbol(s). The existing data for symbol(s) is retained. Use this when a stock is acquired, delisted, or you simply want to stop tracking it but do not want to purge the historical data.

split adjusts the price database, and the portfolio holdings, for stock splits. The default factor is 2, this can be adjusted with the option --splitby. The dates arguments can be set with --prevdate and --date.

delete removes the given symbols from the database.

destroydb deletes the BeanCounter database.

checkdbconnection simply opens and closes the database handle, and returns a specified exit code which can then be tested. This is used in the setup_beancounter command.

warranty display a short GNU General Public License statement.

--currency can be used to select a different home currency. Instead of having all values converted to the default currency, the selected currency is used.

--date allows to choose a different reference date. This is then be be used by commands working on a date, or date period, such as plreport, dayendreport, backpopulate, fxbackpopulate or status. --prevdate allows to choose a different start date for return calculations, or data gathering.

--restriction can be used to restrict the database selection. The argument must be a valid part of valid SQL statement in the sense that existing columns and operators have to be employed. The argument to this option will be completed with a leading and. The SQL restriction will typcally be over elements of the portfolio table which comprises the columns symbol, shares, currency, type, owner, cost and date. A simple example would be currency='CAD'. Note that this has to protected by double quotes "I on the command-line.

--extrafx allows to gather data on additional currency rates beyond those automatically selected as shares are listed in them. A typical example would be for a European investor wanting to convert from the EUR in which the shares are listed into one of the member currencies which beancounter would no longer retrieve as shares are no longer listed in these.

--forceupdate allows to overwrite an potentially wrong date in the database update. Unfortunately, it appears that Yahoo! occasionally reports correct prices with an incorrect date such as the previous day's. In such a case, this option, along with an argument such as 'today' can override the bad date datapoint and avoid a hole in the database. The downside of this approach is that it would double the previous data in the case of a public holiday, or even if it was run the weekend. A somewhat smarter comparison to previously stored data might prevent that, but would be more complex to implement.

--rcfile allows to specify a resource file different from the default ~/.beancounterrc.

--dbsystem allows to switch to a different database backend. The default is PostgreSQL but MySQL and SQLite are also supported. For SQLite, the default is now version 3.* but the previous version which is not binarily compatible is supported as well with argument 'SQLite2'.

--dbsystem allows to switch to an alternate database. The default is 'beancounter'. This can be useful for testing new features.

--fxupdate is a boolean switch to enforece updates of FX rates during 'update'. The default is 'true' but '--nofxupdate' can be used to suppress the update of foreign exchange rates.

Similarly, --equityupdate is a boolean switch to enforece, or suppress updates of Equity (i.e. stock) data during 'update'. The default is 'true' but '--noequityupdate' can be used to suppress the update of foreign exchange rates.

--pacificfx is a boolean switch to use the 'PACIFIC' FX rate service from the Sauder School at UBC. This is useful when the default FX rate service at Yahoo! is erratic, or unreliable. The Yahoo! is still the default as it provide more columns (open/high/low). However, the PACIFIC server provides a wider variety of exchange rates.

--splitby can be used to set a stock split factor other than the default of 2.

Also, --commit is a boolean switch to suppress actual database updates if the negated --nocommit is selected. This is useful mostly in debugging contexts.

The --verbose and --debug switches can be used in debugging an testing, and --help triggers the display of help message.

The following section details some of the database and configuration options.

beancounter currently depends on either PostgreSQL, MySQL, SQLite (version 2 or 3) or any other database for which an ODBC driver is available (though the required tables would have to created manually in the ODBC case). Yet another DB backend could be added provided suitable Perl DBI drivers are available. For PostgreSQL, MySQL and SQLite, the setup_beancounter script can create and initialize the database, form the required tables and fills them with some example data. It is a starting point for local modifications.

The connection to the database is made via a dedicated function in the BeanCounter.pm module, changes would only have to be made there. As of this writing the Perl DBI (the database-independent interface for Perl) is used along the DBI drivers for PostgreSQL, MySQL, SQLite and ODBC. Ports for Oracle, Sybase, ... are encouraged.

A configuration file ~/.beancounterrc is read if found. It currently supports the following options:

currency to specify into which home currency holdings and profits/losses have to be converted

host to specify the database server on which the BeanCounter database resides (this is needed only for the alternate connection via the DBI-Pg driver in case DBI-ODBC is not used)

user to specify the userid for the database connection; if needed. If not specified, the current user id is used.

passwd to specify the password for the database connection, if needed.

dbsystem to select a database backend, e.g. to switch from PostgreSQL to MySQL or SQLite or SQLite2 (the previous format of SQLite).

dbsystem to select a different default database name other than the default of 'beancounter'

proxy to specify the address of a firewall proxy server if one is needed to connect to the Internet.

firewall to specify a firewallid:firewallpasswd combination, if needed.

odbc is a switch to turn ODBC connection on or off

dsn to use a different data source name when ODBC is used

An example file example.beancounterrc should have come with the sources (or the Debian package); please consult this file for more examples.

There are now several ODBC systems available for Linux / Unix. The following ~/.odbc.ini work with the iODBC library and the PostgreSQL ODBC driver on my Debian GNU/Linux system:

   [ODBC Data Sources]
   beancounter = BeanCounter Database

   [beancounter]
   Driver       = /usr/lib/libpsqlodbc.so
   Database     = beancounter
   Servername   = localhost

   [ODBC]
   InstallDir = /usr/lib

Alternatively, the unixODBC library can be used with the following scheme for /etc/odbcinst.ini (or ~/.odbcinst.ini) to define the Postgres database drivers

   [PostgreSQL]
   Description     = PostgreSQL ODBC driver for Linux and Windows
   Driver          = /usr/lib/postgresql/lib/libodbcpsql.so
   Setup           = /usr/lib/odbc/libodbcpsqlS.so
   Debug           = 0
   CommLog         = 0
   FileUsage       = 1

after which /etc/odbc.ini (or ~/.odbc.ini) can be used to define actual data sources as follows:

   [PostgreSQL]
   Description     = PostgreSQL template1
   Driver          = PostgreSQL
   Trace           = No
   TraceFile       = /tmp/odbc.log
   Database        = template1
   Servername      = localhost
   UserName        =
   Password        =
   Port            = 5432
   Protocol        = 6.4
   ReadOnly        = Yes
   RowVersioning   = No
   ShowSystemTables= No
   ShowOidColumn   = No
   FakeOidIndex    = No
   ConnSettings    =

   [beancounter]
   Description     = Beancounter DB (Postgresql)
   Driver          = Postgresql
   Trace           = No
   TraceFile       =
   Database        = beancounter
   Servername      = some.db.host.com
   UserName        =
   Password        =
   Port            = 5432
   Protocol        = 6.4
   ReadOnly        = No
   RowVersioning   = No
   ShowSystemTables= No
   ShowOidColumn   = No
   FakeOidIndex    = No
   ConnSettings    =

Finance::BeanCounter and beancounter are so fresh that there are only missing features :) Seriously, check the TODO list. This code or its predecessors have been used by the author since the end of 1998.

Finance::BeanCounter.3pm, smtm.1, Finance::YahooQuote.3pm, LWP.3pm, Date::Manip.3pm, Statistics::Descriptive.3pm, setup_beancounter.1, update_beancounter.1.

beancounter is (c) 2000 - 2005 by Dirk Eddelbuettel <edd@debian.org>

Updates to this program might appear at http://dirk.eddelbuettel.com/code/beancounter.html.

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. There is NO warranty whatsoever.

The information that you obtain with this program may be copyrighted by Yahoo! Inc., and is governed by their usage license. See http://www.yahoo.com/docs/info/gen_disclaimer.html for more information.

Equivalently, foreign exchange rates from http://fx.sauder.ubc.ca are for academic research and teaching. See http://fx.sauder.ubc.ca/about.html for more details.

The Finance::YahooQuote module, originally written by Dj Padzensky (and on the web at http://www.padz.net/~djpadz/YahooQuote/ as well as at http://dirk.eddelbuettel.com/code/yahooquote) serves as the backbone for data retrieval, which was also already very useful for the real-time ticker http://dirk.eddelbuettel.com/code/smtm.html.