[R] Difference in Levene's test between R and SPSS

Ravi Kulkarni ravi.kulk at gmail.com
Mon Feb 15 05:02:28 CET 2010

  I notice that when I do Levene's test to test equality of variances across
levels of a factor, I get different answers in R and SPSS 16.
  e.g.: For the chickwts data, in R, levene.test(weight, feed) gives
F=0.7493, p=0.5896.
SPSS 16 gives F=0.987, p=0.432

  Why this difference? Which one should I believe? (I would like to believe
R :)

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