## Calculate mean using proc sql and case when

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Regular Contributor
Posts: 209

# Calculate mean using proc sql and case when

I would like to find two means of a field called close_diff.
close_diff has some missing values.
One mean (mean_ca_close_diff) is conditional on incident_with_ca=1 and action (character field) not equal to missing.
The other (mean_noca_close_diff) mean is conditional on incident_with_ca=1 and action (character field) equal to missing.
The two means calculated using the code below are the same, however, they shouldn't be.
Any idea how to fix this?

proc sql;
create table EE_1 as
select *,
case when (incident_with_ca=1 and action ne "")
then mean(close_diff) else . end as mean_ca_close_diff,
case when (incident_with_ca=1 and action = "")
then mean(close_diff) else . end as mean_noca_close_diff
from EE
group by INJURY_YEAR
order by EHS_ID
;
quit;

Thank you.

Accepted Solutions
Solution
‎09-18-2017 11:49 PM
Super Contributor
Posts: 285

## Re: Calculate mean using proc sql and case when

``````proc sql;
create table EE_1 as
select *,

mean(case
when incident_with_ca=1 and action ne ""
then close_diff else .
end) as mean_ca_close_diff,

mean(case
when incident_with_ca=1 and action = ""
then close_diff else .
end) as mean_noca_close_diff
from EE
group by INJURY_YEAR
order by EHS_ID
;
quit;``````

All Replies
Super Contributor
Posts: 285

## Re: Calculate mean using proc sql and case when

Case when syntax is not correct.
Regular Contributor
Posts: 209

## Re: Calculate mean using proc sql and case when

OK, how should I fix the syntax?

Super Contributor
Posts: 285

## Re: Calculate mean using proc sql and case when

I will post when I get home.
Solution
‎09-18-2017 11:49 PM
Super Contributor
Posts: 285

## Re: Calculate mean using proc sql and case when

``````proc sql;
create table EE_1 as
select *,

mean(case
when incident_with_ca=1 and action ne ""
then close_diff else .
end) as mean_ca_close_diff,

mean(case
when incident_with_ca=1 and action = ""
then close_diff else .
end) as mean_noca_close_diff
from EE
group by INJURY_YEAR
order by EHS_ID
;
quit;``````
Regular Contributor
Posts: 209