如何在SAS中重新编码变量？

Question

I tried to recode the missing values but instead lost all my other variables within a dataset

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BEFORE:

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AFTER:

        data work.newdataset;
        if (year =.) then year = 2000;
        run;

Answer 1

You are missing the SET statement.

data want;
set have;
myvar=5;
run;

will create a new dataset, want , from have , with the new variable value applied (or the recode or whatever). You could also do

data have;
set have;
myvar=5;
run;

That would replace have with itself plus the recode/whatever. This is actually less common in SAS; it is often preferable to do all recodes in one step, but to create a new dataset (so that the code is reversible easily).