Hi - I wish to compare two variables within repeated observations on
subjects using -somersd-. If I use the "wstrata" option, would the
standard error also be adjusted to take care of the non-independent
observations pertaining to the same subject? Apparently I can't use
"cluster" and "wstrata" on the same variable. I don't think I want to
use "cluster" alone if I want the comparisons to be within each subject.
Al Feiveson
. somersd z6a age,wstrata(id)
Symmetric 95% CI
------------------------------------------------------------------------
------
| Jackknife
z6a | Coef. Std. Err. z P>|z| [95% Conf.
Interval]
-------------+----------------------------------------------------------
------
age | .3608484 .0250542 14.40 0.000 .311743
.4099537
. somersd z6a age,wstrata(id) cluster(id)
Symmetric 95% CI
(Std. Err. adjusted for 403 clusters
in id)
------------------------------------------------------------------------
------
| Jackknife
z6a | Coef. Std. Err. z P>|z| [95% Conf.
Interval]
-------------+----------------------------------------------------------
------
age | (dropped)
------------------------------------------------------------------------
------
. somersd z6a age,cluster(id)
Symmetric 95% CI
(Std. Err. adjusted for 403 clusters
in id)
------------------------------------------------------------------------
------
| Jackknife
z6a | Coef. Std. Err. z P>|z| [95% Conf.
Interval]
-------------+----------------------------------------------------------
------
age | .4528894 .0239833 18.88 0.000 .4058829
.4998958
------------------------------------------------------------------------
------
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