I don't think R will complain, if you use the approach below. However,
IF, VVS1 and VVS2 are linearly dependent.
Better use the factor approach and define which factor should be the
contrast
Nikhil
On 16 Dec 2009, at 10:12AM, Petr PIKAL wrote:
what commands did you use for regression
I suppose
lm(Price~Weight+IF+VVS1+VVS2, data=your.data)
shall not complain if your.data is a data frame.
Regards
Petr
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