Hi, I am seeking help with an error when running the example from R
Documentation for TukeyHSD. The error occurs with any example I run, from
any text book or website. thank you...
> plot(TukeyHSD(fm1, "tension")).
Error in plot(confint(as.glht(x)), ylim = c(0.5, n.contrasts + 0.5), ...) :
error in evaluating the argument 'x' in selecting a method for function
'plot': Error in UseMethod("vcov") :
no applicable method for 'vcov' applied to an object of class "NULL"
> ?TukeyHSD
> require(graphics)
> summary(fm1 <- aov(breaks ~ wool + tension, data = warpbreaks))
Df Sum Sq Mean Sq F value Pr(>F)
wool 1 451 450.7 3.339 0.07361 .
tension 2 2034 1017.1 7.537 0.00138 **
Residuals 50 6748 135.0
---
Signif. codes: 0 *** 0.001 ** 0.01 * 0.05 . 0.1 1
> TukeyHSD(fm1, "tension", ordered = TRUE)
Tukey multiple comparisons of means
95% family-wise confidence level
factor levels have been ordered
Fit: aov(formula = breaks ~ wool + tension, data = warpbreaks)
$tension
diff lwr upr p adj
M-H 4.722222 -4.6311985 14.07564 0.4474210
L-H 14.722222 5.3688015 24.07564 0.0011218
L-M 10.000000 0.6465793 19.35342 0.0336262
> plot(TukeyHSD(fm1, "tension"))
Error in plot(confint(as.glht(x)), ylim = c(0.5, n.contrasts + 0.5), ...) :
error in evaluating the argument 'x' in selecting a method for function
'plot': Error in UseMethod("vcov") :
no applicable method for 'vcov' applied to an object of class "NULL"
>
> sessionInfo()
R version 2.15.0 (2012-03-30)
Platform: i386-pc-mingw32/i386 (32-bit)
attached base packages:
[1] grid tcltk splines stats graphics grDevices datasets
utils methods base
other attached packages:
[1] RcmdrPlugin.HH_1.1-30 HH_2.2-30 latticeExtra_0.6-19
RColorBrewer_1.0-5
[5] leaps_2.9 multcomp_1.2-12 mvtnorm_0.9-9992
NADA_1.5-4
[9] ggplot2_0.9.0 Rcmdr_1.8-3 car_2.0-12
nnet_7.3-1
[13] DAAG_1.12 survival_2.36-12 randomForest_4.6-6
rpart_3.1-52
[17] RODBC_1.3-5 tree_1.0-29 spatstat_1.25-5
mgcv_1.7-13
[21] sciplot_1.0-9 spdep_0.5-45 coda_0.14-6
deldir_0.0-16
[25] maptools_0.8-14 foreign_0.8-49 nlme_3.1-103
MASS_7.3-17
[29] boot_1.3-4 sp_0.9-98 odesolve_0.9-9
mcmc_0.8
[33] lme4_0.999375-42 Matrix_1.0-6 lattice_0.20-6
chron_2.3-42
[37] akima_0.5-7 rcom_2.2-3.1.1 rscproxy_1.3-1
loaded via a namespace (and not attached):
[1] colorspace_1.1-1 dichromat_1.2-4 digest_0.5.2 memoise_0.1
munsell_0.3 plyr_1.7.1
[7] proto_0.3-9.2 reshape2_1.2.1 scales_0.2.0 stats4_2.15.0
stringr_0.6 tools_2.15.0
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