No subject
A.W. Shingleton
aws25 at cus.cam.ac.uk
Mon Apr 23 18:53:07 CEST 2001
I am trying to caculate the standard errors of treatment means from an LME
analysis. R gives me the coefficients of the model, from which I can
calculate the means of a particular combination of treatments. It also
gives me the standard error of each coefficients. How do I convert these
into standard errors of the means. For example:
Fixed effects: log(y) ~ log(x) + A + B + C
Value Std.Error DF t-value p-value
(Intercept) 0.2710230 0.08237595 471 3.29007 0.0011
log(x) 0.9126175 0.01905999 471 47.88131 <.0001
A 0.3712639 0.08057310 58 4.60779 <.0001
B -0.0772743 0.09460152 58 -0.81684 0.4174
C 0.2617046 0.06659040 58 3.93006 0.0002
X is a continuous variable, and A, B, and C, are two-level catagorical
variables. I wish to know the SE of the fitted value of y when, say, x=5,
A=1, B=2 and C=1. Can anyone help??
Many thanks
Alex Shingleton
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* Alex Shingleton *
* *
* Department of Zoology *
* University of Cambridge *
* Downing Street *
* Cambridge CB2 3EJ *
* *
* tel: 01223 331768 *
* fax: 01223 336676 *
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