R help - Aug 2007 - percentage explained by fixed effects in random model

Hi,

I realise this has come up before in various reincarnations but I couldnt
find the answer...

I wish to quote the "percentage variance explained" by each of three
components in my mixed model.

If I didnt have a random effect I would just use r squared. I can work out
the percentage explained by the random effect using summary() but this
doesnt give variance for the fixed effects.

Linear mixed-effects model fit by REML
Formula: yell ~ carot.code + weight16 + (1 | fosterbrood)
   Data: colour
      AIC      BIC    logLik MLdeviance REMLdeviance
 1555.455 1576.282 -772.7276   1536.585     1545.455
Random effects:
 Groups      Name        Variance Std.Dev.
 fosterbrood (Intercept) 1.0747   1.0367
 Residual                1.1363   1.0660
# of obs: 476, groups: fosterbrood, 61

Fixed effects:
              Estimate Std. Error  DF t value Pr(>|t|)
(Intercept)  -3.187028   1.011828 473 -3.1498 0.001737 **
carot.code1   0.201951   0.098442 473  2.0515 0.040771 *
weight16      0.168861   0.054273 473  3.1114 0.001975 **
---
Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05
'.' 0.1 ' ' 1

Correlation of Fixed Effects:
            (Intr) crt.c1
carot.code1  0.035
weight16    -0.989 -0.084

I was thinking of (cheating by) taking the residuals from a regression
with the random effect (fosterbrood) as a fixed effect, then correlating
these with my two x variables?

Any better ideas?

Thanks in advance, Simon.

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