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lm1
2007 Aug 06
1
test the significances of two regression lines
R-help,
I'm trying to test the significance of two regression lines
, i.e. the significance of the slopes from two samples
originated from the same population.
Is it correct if I fit a liner model for each sample and
then test the slope signicance with 'anova'. Something like this:
lm1 <- lm(Y~ a1 + b1*X) # sample 1
lm2 <- lm(Y~ a2 + b2*X) # sample 2
anova(lm1, lm2)
2002 Sep 14
0
p.s. regarding stripchart missing-data report (PR#2019)
...anova(lm8)
#lm9 <- lm(minrisk.numbers.sm ~ truste.score+mss.m.score+worry.numbers.sm+stai.score)
#anova(lm9)
lm10 <- lm(minrisk.numbers.sm ~ truste.score+mss.m.score+worry.numbers.sm+sex+educ+age)
anova(lm10)
lm11 <- lm(minrisk.numbers.sm ~ truste.score+worry.numbers.sm)
anova(lm11)
#lm12 <- lm(nprob.m[,1,5,9] ~ worry.numbers.sm+pc.had+stai.score)
#anova(lm12)
#lm 13-15 used above
# tells you which Ss said both
#apply((minrisk.m==1 & exagg.m==1)+0,1,sum,na.rm=T)
toohigh.sm <- apply(nprob.m>rightans.m,1,mean,na.rm=T)
toohigh.numbers.sm <- apply(nprob.m[,5:12]>r...