Creates a minimal representation of a data frame.
Given a data frame with a defined response variable, this function creates a unique representation of the covariates in the data frame, vector (matrix) of responses, and a pointer vector, connecting the responses with the corresponding covariates.
cro(dat, response = 1)
dat |
A data frame |
response |
The column(s) where the response resides. |
The rows in the data frame are converted to text strings with paste
and compared with match.
A list with components
y |
The response. |
covar |
A data frame with unique rows of covariates. |
keys |
Pointers from |
This function is based on suggestions by Anne York and Brian Ripley.
Göran Broström
dat <- data.frame(y = c(1.1, 2.3, 0.7), x1 = c(1, 0, 1), x2 = c(0, 1, 0)) cro(dat)
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