I have 2 columns for weight. There are NAs in each column but not for the
same observation. Some observations have values for both.  I would want to
prioritize the WT2 values so I would like to do the following:

>From this:
ID          WT1    WT2
1           134      NA
2           145       155
1            NA      175
3            NA      187

To this:
ID    WT1       WT2    WT
1        NA         175     175
2      145         155      155
3       NA         187      187

Populating the NA values of wt2 with those of wt1 would work as well. Any
suggestions would be greatly appreciated.
-- 
Holly Shakya

Doctoral Student
San Diego State University/University of California, San Diego
Joint Doctoral Program in Public Health
(Global Health)

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