R Help -
Why is that in the results below, changing the order of the factor
(trialType2: levels - DD, SD, DS, SS) changes the estimates in the fixed
effects tests?
> tmp.dat4$trialType2 <- sort(tmp.dat4$trialType, decreasing = TRUE)
> mod2c <- lme(proportion.down ~ trialType2, data = tmp.dat4, random = ~ 1
| subject, na.action = na.omit, method = "ML")
> summary(mod2c)
Linear mixed-effects model fit by maximum likelihood
Data: tmp.dat4
AIC BIC logLik
27.92306 48.23003 -7.961531
Random effects:
Formula: ~1 | subject
(Intercept) Residual
StdDev: 0.3800017 0.1530272
Fixed effects: proportion.down ~ trialType2
Value Std.Error DF t-value p-value
(Intercept) 0.6788875 0.08613476 141 7.881690 0.0000
trialType2DS 0.0287062 0.11267357 141 0.254773 0.7993
trialType2SD -0.0197194 0.12142018 141 -0.162406 0.8712
trialType2SS -0.0941918 0.12204707 141 -0.771766 0.4415
Correlation:
(Intr) trT2DS trT2SD
trialType2DS -0.658
trialType2SD -0.709 0.467
trialType2SS -0.706 0.464 0.571
Standardized Within-Group Residuals:
Min Q1 Med Q3 Max
-3.67176824 -0.22090663 0.08677971 0.14331603 2.86301670
Number of Observations: 218
Number of Groups: 74
> tmp.dat4$trialType2 <- sort(tmp.dat4$trialType, decreasing = FALSE)
> mod2c <- lme(proportion.down ~ trialType2, data = tmp.dat4, random = ~ 1
| subject, na.action = na.omit, method = "ML")
> summary(mod2c)
Linear mixed-effects model fit by maximum likelihood
Data: tmp.dat4
AIC BIC logLik
27.92306 48.23003 -7.961531
Random effects:
Formula: ~1 | subject
(Intercept) Residual
StdDev: 0.3800017 0.1530272
Fixed effects: proportion.down ~ trialType2
Value Std.Error DF t-value p-value
(Intercept) 0.5846957 0.08646554 141 6.762181 0.0000
trialType2DS 0.0744724 0.11277773 141 0.660347 0.5101
trialType2SD 0.1228981 0.12175741 141 1.009368 0.3145
trialType2SS 0.0941918 0.12204707 141 0.771766 0.4415
Correlation:
(Intr) trT2DS trT2SD
trialType2DS -0.660
trialType2SD -0.710 0.469
trialType2SS -0.708 0.468 0.573
Standardized Within-Group Residuals:
Min Q1 Med Q3 Max
-3.67176824 -0.22090663 0.08677971 0.14331603 2.86301670
Number of Observations: 218
Number of Groups: 74
--
*Edward H Patzelt | Research Assistant
Psychology | University of Minnesota | Elliott Hall, 75 East River Road |
Minneapolis, MN 55455
Email: patze...@umn.edu |
Main: 612.626.0072
|
Mobile: 651.315.3410
| Office: S355
**
*
[[alternative HTML version deleted]]
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
