Indices of observations in a model data frame
Find sequential indices for observations in a data frame corresponding to the unique combinations of the levels of a given model term from a model object or a data frame
dataIndex(x, term)
x |
Either a data frame or a model object |
term |
The name of one term in the model, consisting only of factors |
A vector of indices.
Michael Friendly
factors <- expand.grid(A=factor(1:3),B=factor(1:2),C=factor(1:2)) n <- nrow(factors) responses <-data.frame(Y1=10+round(10*rnorm(n)),Y2=10+round(10*rnorm(n))) test <- data.frame(factors, responses) mod <- lm(cbind(Y1,Y2) ~ A*B, data=test) dataIndex(mod, "A") dataIndex(mod, "A:B")
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