Pseudo R2 In R. Although theres no commonly accepted agreement on how to assess the fit of a logistic regression there are some approaches. The rationale for this formula is.
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The Cox and Snell R2 is. While it is strictly true that logistic regression does not give you an r-squared calculated the same as in ordinary least squares regression you can get a pseudo- R2 using proc logistic. Nov 03 2009 The pseudo-R2 simply compares the log-likelihood from the null model only an intercept to the log-likelihood from the full model all covariates included.
Pseudo R2 Statistics Description.
Its sometimes referred to as a pseudo R2. The constant-only model would be without any of the parameters only the intercept term. Image by Author McFaddens Pseudo-R. A correction known as the Nagelkerke pseudo-R 2 Nagelkerke 1991 adjusts it to range between zero and one by the simple expedient of dividing it by its maximum possible value.
