topic Re: Proc sgplot: cant add standard deviation to median in Graphics Programming

Proc sgplot: cant add standard deviation to median

ari — Wed, 26 Feb 2020 10:32:20 GMT

Hi All,

I cant add standard deviation to calculated median values.

WARNING: Limit bars can only be generated with the MEAN statistic. The LIMITS= option will be
ignored.

SAS prints this warning in the log.

Is there a way to overcome this issue and show SD with Median values?

My code:

proc sgplot data=test;
vline time / response=chg group=dose stat=median limitstat=stddev;
xaxis label= "Time ";
yaxis label="value";
run;

Re: Proc sgplot: cant add standard deviation to median

PaigeMiller — Wed, 26 Feb 2020 11:50:20 GMT

@ari wrote:

Hi All,

I cant add standard deviation to calculated median values.

WARNING: Limit bars can only be generated with the MEAN statistic. The LIMITS= option will be
ignored.

SAS prints this warning in the log.

Is there a way to overcome this issue and show SD with Median values?

No.

You'd have to create some sort of custom calculation of median + standard deviation in a data step, and then plot that via SGPLOT or other

Re: Proc sgplot: cant add standard deviation to median

Kurt_Bremser — Wed, 26 Feb 2020 11:54:28 GMT

Standard Deviation is by definition calculated form a mean, not a median. See https://en.wikipedia.org/wiki/Standard_deviation