Hello All, I have data like - PT Visit1 Visit2 Visit3 Visit4 Visit5 1001 2 . 5 7 11 1002 5 7 . . 9 1003 . 5 6 11 8 1004 7 7 11 . . 1005 . 11 8 9 . I want to use Array to impute the missing value with the average of adjacent non-missing value. E.g. = for Pt. 1001 - for missing Visit2 I would expect the average of (Visit1+Visit3)/2 Same for Pt 1002 - for missing Visit3 and Visit 4, I would expect the average of (Visit2+Visit5)/2 . In later cases, I dont want imputation as I dont have adjacent values present completely. Does anyone know how to handle this case in array? Thanks, PankP
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