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partha1
Fluorite | Level 6

How to detect influential observations in logistic regressiobn?

4 REPLIES 4
Rick_SAS
SAS Super FREQ

The documentation for the influence diagnostics says "the distributions of these diagnostic statistics are not known, so cutoff values cannot be given for determining when the values are large." To use these statistics, you plot them against an index and look for outliers.

partha1
Fluorite | Level 6
Should i plot cook's D against predicted probabilities?
How to decide which one is outlier in absence of any cutoff value?
PGStats
Opal | Level 21

What is an outlier? The answer depends on you, the analyst. An influential observation can be an important observation to explain what's going on in your data or it might be an aberrant case where something went wrong. Influence diagnostics tell you which cases are worth investigating, nothing more.


If some cases are much more influential than the rest, then go to the source and seek answers about those.

PG
Ksharp
Super User
Check MODEL statement option OBSTATS  in PROC GENMOD .

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