Hi all,
I'm trying to create a summary of the overall_days variable, and also giving a proportion of observations where overall_days are above 360 and 730. But the syntax doesn't seem to work quite right... wondering if there's a way around this? Thank you!
proc sql;
create table summary as
select min(overall_days) as min,
max (overall_days) as max,
mean (overall_days) as mean,
median (overall_days) as median
count(enrolid) where overall_days>730 / count(enrolid) as proportion_730,
count(enrolid) where overall_days>365 / count(enrolid) as proportion_365
from temp.base;
quit;
Yeah, you can't apply WHERE like that within a statement. But you can use the conditional logic trick to get it.
SAS evaluates boolean conditions to 0/1, and then you can sum the 1's to get the number you need.
Overall_Days>730 -> resolves to 0/1 for each record.
Counting it would still give you the total N, but SUM would add up all the 1's.
You could also use a subquery and CASE statements but this seems easier IMO.
sum(overall_days>730) / count(enrolid) as proportion_730
@cdubs wrote:
Hi all,
I'm trying to create a summary of the overall_days variable, and also giving a proportion of observations where overall_days are above 360 and 730. But the syntax doesn't seem to work quite right... wondering if there's a way around this? Thank you!
proc sql; create table summary as select min(overall_days) as min, max (overall_days) as max, mean (overall_days) as mean, median (overall_days) as median count(enrolid) where overall_days>730 / count(enrolid) as proportion_730, count(enrolid) where overall_days>365 / count(enrolid) as proportion_365 from temp.base; quit;
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