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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

***************************
* Alex Shingleton         *
*                         *
* Department of Zoology   *
* University of Cambridge *
* Downing Street          *
* Cambridge CB2 3EJ       *
*                         *
* tel: 01223 331768       *
* fax: 01223 336676       *
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