Population Stability Index(PSI)

Updated: 2018-07-01

Population Stability Index

For each bin:

PSIi=(Actual%Expected%)×ln(Actual%/Expected%)PSI_i = (Actual\% - Expected\%)\times \ln(Actual\% / Expected\%)

Total:

PSI=(PSIi)PSI = \sum(PSI_i)

Result:

PSI Value Inference
<= 0.1 Insignificant change
0.1 – 0.25 minor change
> 0.25 Major shift in population