Displaying 3 results from an estimated 3 matches for "taov".
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tao
2004 Aug 26
1
library(car) Anova() and Error-term in aov()
.... Or am I
tackling Type III calculation, in this case with Error(), the wrong way
(besides ignoring advice concerning Type I vs III)??
For instance,
dat <- rnorm(12)
pp <- factor(c(rep(1:3,2), rep(4:6,2)))
betw <- gl(2,6)
A <- factor(rep(c(rep('a',3),rep('b',3)), 2))
taov <- aov(dat~betw*A+Error(pp/A))
Anova(taov, type="III") # Goes wrong with following error.
#Error in Anova(taov, type = "III") : no applicable method for "Anova"
Phrased differently, ?Anova says "Calculates type-II or type-III
analysis-of-variance tables for m...
2005 Nov 09
0
contrasts
...Df Sum Sq Mean Sq F value Pr(>F)
w 1 1.3889 1.3889 1.1364 0.3465
gp:w 1 0.2222 0.2222 0.1818 0.6918
Residuals 4 4.8889 1.2222
...
with contrasts i got the same results using the following code:
contr <- matrix(c(
1, 1, 1, 1, 1, 1,-1, -1, -1,-1,-1,-1,), ncol=1)
taov <- aov(cbind (
w1x1y, w1x1y2, w1x1y3, w1x2y, w1x2y2, w1x2y3,w2x1y, w2x1y2, w2x1y3,
w2x2y, w2x2y2, w2x2y3) %*% contr ~ gp, data = both.mul)
summary(taov,intercept=T)
now, things get a little more complicated for the three-level factor,
'y.' If my memory serves me correctly, i can ac...
2004 Apr 23
0
Sum Sq of SPSS and R different for repeated measures Anova
...;data.txt') # data set attached as text.
avg.cond[1:5,]
# pp pictcat cond rt exp
#1 1 animal con 517.8125 exp11b
#2 2 animal con 425.9375 exp11b
#3 3 animal con 379.6563 exp11b
#4 4 animal con 410.6563 exp11b
#5 5 animal con 420.3125 exp11b
Then I do the anova:
summary(taov <- aov(rt~exp*pictcat*cond+Error(pp/(pictcat*cond)),
data=subset(avg.cond, cond=='con'|cond=='incon')))
#
#Error: pp
# Df Sum Sq Mean Sq F value Pr(>F)
#exp 1 178 178 0.0102 0.9202
#Residuals 39 683329 17521
#
#Error: pp:pictcat
# Df Sum S...