Hi all, I have a dataset (see below) that contains interest rate for 1, 2, 3, 5, 7 and 10 year securities. I'd like to interpolate the rates to gather the rates for 4, 6, 8, and 9 years. I looked up the PROC EXPAND procedure but am not quite sure if it's appropriate to use it in my case. Time Period tenyr sevenyr fiveyr threeyr twoyr oneyr 1976 7.61 7.42 7.18 6.77 6.31 5.88 1977 7.42 7.23 6.99 6.68 6.45 6.08 1978 8.41 8.36 8.32 8.29 8.33 8.34 1979 9.43 9.47 9.51 9.7 10.11 10.65 1980 11.43 11.4 11.45 11.51 11.73 12 1981 13.92 14.07 14.25 14.46 14.57 14.8 1982 13.01 13.06 13.01 12.93 12.8 12.27 1983 11.1 11.02 10.79 10.45 10.21 9.58 1984 12.46 12.42 12.26 11.92 11.67 10.91 1985 10.62 10.5 10.12 9.64 9.27 8.42 1986 7.67 7.54 7.3 7.06 6.86 6.45 Thank you very much for your suggestions! Sabrina
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