## how to calculate sum and replace it in missing value

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Occasional Contributor
Posts: 18

# how to calculate sum and replace it in missing value

I have a dataset as below

PT     N

102   25

103   34

Total   .

I need to replace the missing with the sum of the 2 counts in N. Can i do that in datastep?

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Solution
‎10-20-2017 05:39 AM
Super User
Posts: 8,929

## Re: how to calculate sum and replace it in missing value

You can retain a variable where you sum up all N values, and when PT = 'Total', you set N to that value.

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Maxims of Maximally Efficient SAS Programmers

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Solution
‎10-20-2017 05:39 AM
Super User
Posts: 8,929

## Re: how to calculate sum and replace it in missing value

You can retain a variable where you sum up all N values, and when PT = 'Total', you set N to that value.

---------------------------------------------------------------------------------------------
Maxims of Maximally Efficient SAS Programmers
Super User
Posts: 8,798

## Re: how to calculate sum and replace it in missing value

Whilst @KurtBremser has given you the answer, I would step back one and ask why you have a dataset which looks like that in the first place.  How have you added "Total" without adding the sum in at the same time, seems like the step before needs changing.  You can add totals on in various ways, my first thought was:

```proc sql;
create table WANT as
select  *
from    HAVE
union all
select  "Total",
sum(N)
from    HAVE;
quit;```

Simply adds a row at the end of the dataset with total.

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