Select the first, second, third variable based on the data

Smitha9 — Thu, 21 Jul 2022 16:06:04 GMT

Hi,

I have a dataset:

ID Sub_ID Measure_year Ht Wt

1 12 06/06/1995 . .

1 13 07/08/1997 . 135

1 14 07/29/1987 66 .

1 15 08/01/1988 56 140

I want the dataset:

where I need to select the Ht which has the first value in it based on the earliest Measure_year with values in Ht and Wt.

ID Sub_ID Measure_time Ht Wt

1 14 07/29/1987 66 135

Can I do this with more ID's?

thank in advance.

-Smitha

Re: Select the first, second, third variable based on the data

Tom — Thu, 21 Jul 2022 16:18:42 GMT

Not sure what you are after, but you might just want to use the UPDATE statement for this. Just use the same dataset with zero observations as the BASE dataset to treat all of the observations as TRANSACTIONS.

data want;
  update have(obs=0) have;
  by id;
run;

If you want the FIRST instead of the LAST then sort the input dataset by ID DESCENDING MEASURE_YEAR

You could also try using the MERGE statement.

data ht;
  set have;
  where not missing(ht);
  by id;
  if first.id;
  keep id measure_year ht ;
  rename measure_year=ht_year;

run;
data wt;
  set have;
  where not missing(wt);
  by id;
  if first.id;
  keep id measure_year wt ;
  rename measure_year=wt_year;
run;

data want;
  merge ht wt;
  by id;
run;

topic Select the first, second, third variable based on the data in New SAS User

Select the first, second, third variable based on the data

Re: Select the first, second, third variable based on the data