Didn't hear from anyone, so I'm trying again (sorry).

I have been creating a dataset using epidata. I was looking through the documentation->codebook to get a sense of the distribution ofvalues for thevariables. I just noticed that the missing values (.) appear at an almost random point in the otherwise ordered list (in this example,between 9 and 10). I compared the codebook with SAS tables and the data appear to be correct.

tabulation: Freq. Pct. Value Label 2 3.8 3 1 1.9 4 2 3.8 5 6 11.5 7 7 13.5 8 7 13.5 9 6 11.5 . 21 40.4 10

Any ideas why this might happen?

thanks.

Richard Herrell NIH

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