[R] question about mean

[Rolf Turner]

On 9/02/2009, at 4:40 PM, Bill.Venables at csiro.au wrote:

> Store your 'matrix' as a data frame.

	Surely it's a data frame already, since ``school'' is character or  
factor,
	and ``value'' is (must be?) numeric.

	People have this unfortunate predilection to refer to data frames as
	matrices, and this messes them, and everybody else, up.

		cheers,

			Rolf


<snip>

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