topic Re: min, max, mean, std of values in a single observation in SAS Programming

min, max, mean, std of values in a single observation

DocMartin — Wed, 19 Apr 2017 13:48:56 GMT

I have the following data set resp:

PatientID RespRate1 RespRate2 .... RespRate20

XYZ 16 18 17

ACW 21 17 21

For each row (PatientID) I want to be able to obtain the min, max, mean, and std of the first 10 respiratory rates, then the next ten respiratory rates. I wanted to do this:

data resp; set resp;

min1 = min(of RespRate1-RespRate10);

max1 = min(of RespRate1-RespRate10);

mean1 = min(of RespRate1-RespRate10);

std1 = min(of RespRate1-RespRate10);

min2 = min(of RespRate11-RespRate12);

max2 = min(of RespRate11-RespRate20);

mean2 = min(of RespRate11-RespRate20);

std2 = min(of RespRate11-RespRate20);

run;

Yet the min, max, mean, and std functions don't work unless you list out all of the variables, i.e. min1 = min(RespRate1, RespRate2, RespRate3.... RespRate10).

Any ideas on how to do this in Base SAS (I dont want to go over to IML in this instance).

Re: min, max, mean, std of values in a single observation

Reeza — Wed, 19 Apr 2017 13:52:36 GMT

Try using a double dash (--) not single dash.

Re: min, max, mean, std of values in a single observation

Astounding — Wed, 19 Apr 2017 13:55:51 GMT

There's nothing wrong with the code you are using. Why do you say it doesn't work? The only reason I could think of is if you have some character variables instead of numeric. Of course, you need the numeric values populated ... missing values in the input will generate missing values in the output.

Re: min, max, mean, std of values in a single observation

Reeza — Wed, 19 Apr 2017 13:55:56 GMT

Note double dash only works if the variables are side by side. Other option is to declare arrays which you may want to do, if you're doing multiple calculations.

Note you have a typo in one of your ranges.

Array firstTen(*) resprate1-resprate10;

mean1 = mean( of firstTen(*));

mean2 = mean(of resprate1--resprate10);

Re: min, max, mean, std of values in a single observation

DocMartin — Wed, 19 Apr 2017 13:59:50 GMT

This worked! Thanks.