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mage
2012 Apr 16
2
Problems with subset, droplevels and lm: variable lengths differ
...o)
[1] 350
>
> # delete low frequency litho=="GNEID_O" | "MICSH"
> Oslo <- subset(Oslo, !litho %in% c("GNEID_O", "MICSH"), drop=TRUE)
> nrow(Oslo)
[1] 332
> Oslo<- droplevels(Oslo)
> table(Oslo$litho)
CAMSED GNEIS_O GNEIS_R MAGM
98 89 32 113
> nrow(Oslo)
[1] 332
> mod1 <- lm(cbind("Cu", "Fe", "K", "Mg", "Mn", "P", "Zn") ~ litho +
forest + weather, data=Oslo)
Error in model.frame.default(formula = cbind("Cu", &quo...