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Quartz | Level 8

## 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.

1 ACCEPTED SOLUTION

Accepted Solutions
Lapis Lazuli | Level 10

## 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;``````
5 REPLIES 5
Lapis Lazuli | Level 10

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

Case when syntax is not correct.
Quartz | Level 8

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

OK, how should I fix the syntax?

Lapis Lazuli | Level 10

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

I will post when I get home.
Lapis Lazuli | Level 10

## 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;``````
Quartz | Level 8

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

Thank you.

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