Thanks for you response. Proc reg gave me an error under the exponent operator (**), saying "ERROR 22-322: Syntax error, expecting one of the following: a name, ;, -, /,:, _ALL_, _CHARACTER_, _CHAR_, _NUMERIC_, {." proc reg data=reg;
model NPs_per_pop = year year**2;
quit; I tried the syntax of proc loess in one of the examples given, but it wouldn't produce a smoothed plot of my variables: ods graphics on;
proc loess data=reg;
ods output OutputStatistics = Fit
FitSummary=Summary;
model NPs_per_pop = year / degree=2 select=AICC(steps) smooth = 0.6 1.0
direct alpha=.01;
run;
ods graphics off; Either way, though, neither procedure seems to produce an extrapolation of missing data points. Could you give a little more detail on how you were thinking those procedures would fill in missing values based on a fitted curve?

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