Need to calculate daily risk free rate from Fed data

*To*: mathgroup at smc.vnet.net*Subject*: [mg95216] Need to calculate daily risk free rate from Fed data*From*: Andreas <aagas at ix.netcom.com>*Date*: Sun, 11 Jan 2009 06:36:27 -0500 (EST)

The St. Louis Federal Reserve makes a great set of data available for financial analysis at their FRED (Federal Reserve Economic Data) site at http://research.stlouisfed.org/fred2/. I've downloaded treasury bill rates from 1984 to the present (they have lots of rates available at: http://research.stlouisfed.org/fred2/categories/116). The data set gives me the yearly interest rate on 3-Month T-Bills for each day i.e: 1984-12-31, 0.008120 1985-01-01, 0.008120 1985-01-02, 0.008100 1985-01-03, 0.008070 1985-01-04, 0.008080 1985-01-07, 0.008060 1985-01-08, 0.008060 1985-01-09, 0.007950 .. 2008-12-30, 0.000100 2008-12-31, 0.000110 2009-01-01, 0.000110 2009-01-02, 0.000080 2009-01-05, 0.000140 2009-01-06, 0.000140 I need to calculate the daily risk free rate for each interval in the data set based on the yearly rate give for each day. I've gotten as far as this: 1 + yearlyRate == (1 + dailyRate)^360 Does this make sense? If so, how do I implement this in Mathematica? If not, how would I do it? A couple of related questions: Can one use FinancialData[] to access Treasury or Libor rate information or access a risk free rate directly? Thx.