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varadi
2009 Feb 12
0
Comparing slopes in two linear models
...9;ve looked trought the support list for methods for comparing slopes and
found the three explained above:
#d - whole datafrmae
d$Local <- as.factor(d$Local)
dHT <- subset(d, Local!='Palm')
dP <- subset(d, Local!='Palm')
1 - Single dataframe procedure:
fit1 <- lm(log(varCDI) ~ Local + I(log(CDI)) + Local:I(log(CDI)), data=d)
fit2 <- lm(log(varCDI) ~ Local + I(log(CDI)) + Local:I(log(CDI)),
data=dHT)
a1 <- anova(fit1)
a2 <- anova(fit2)
a1
Local:I(log(CDI)) 2 1.183 0.592 7.8741 0.0005574 ***
Residuals 152 11.421 0.075
a2
Local:I(log(CDI))...