02-08-2013 01:48 AM
I'm wondering if anyone could shed some light on this.
I don't understand why the confidence interval of the least squares means I manually calculated as
(logconc LSMEAN) plus/minus (1.96*Standard Error) is different from that produced by SAS.
My code is as below. Your help is greatly appreciated!
proc glm data=out order=internal;
model logconc=Sample / solution;
lsmeans Sample / cl pdiff tdiff stderr e om;