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I am playing around with the car library for R and have encountered the following warning after calling the variance_inflation_factors function on my data model.

No function found corresponding to methods exports from ‘SparseM’ for: ‘coerce’

This error is the result of the following code 

library(car)

data = read.table("path/to/data.txt")
attach(data)

model = lm(Y ~ X1 + X2 + X3)

vif(model)

But still yields a regular output shown as

      X1       X2       X3
1.578524 2.276641 2.021541

All together the output appears as 

Warning message:
no function found corresponding to methods exports from ‘SparseM’ for: ‘coerce’
      X1       X2       X3
1.578524 2.276641 2.021541

Is my output affected by the lack of the coerce method?

FinnM
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  • I had the same warning message when trying to execute an Rscript. Kindly let me know if you found out why the error message is shown. – gibbz00 Jul 28 '15 at 16:33

1 Answers1

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This was an oversight on my part. SparseM was exporting a function called coerce, but there was no such function. This will be corrected in the new version 1.7 of SparseM.

Roger Koenker
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