[R] Tabulation and missing values

From: David Scott <d.scott_at_auckland.ac.nz>
Date: Wed 04 Oct 2006 - 16:10:56 GMT

I think this is one for Gabor. I don't seem to be able to find my way to an answer despite numerous rereadings of factor and table.

Here is a toy example:

### Some data

EthnicCode <- c("European/Other", NA, "European/Other", "European/Other",

                 "Pacific", "European/Other", "European/Other",
                 "European/Other", "Maori", "Maori", "European/Other",
                 "European/Other", "Asian", "Pacific")

### I don't want the categories in the default order
### I also want to be able to include or exclude NA
### argument exclude controls inclusion of NA

### Creating a factor allows reordering
EthnicFactor <- factor(EthnicCode, exclude="") levels(EthnicFactor) <- list("Maori"="Maori","Pacific"="Pacific",

### I can tabulate with categories in the desired order
### But I can't seem to include the missing observations

David Scott

David Scott	Visiting (Until January 07)
 		Department of Probability and Statistics
 		The University of Sheffield
 		The Hicks Building
 		Hounsfield Road
 		Sheffield S3 7RH
 		United Kingdom
Phone:	+44 114 222 3908
Email:	d.scott@auckland.ac.nz

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