Search Ctrl K
Home / Tools
THE FEUTEX TOOLKIT

Two-Bin Population Stability Index

Compare the share of observations in two fixed bins between reference and current populations.

Statistics workspace● Runs in your browser
01 Your input
02 Your result
View or copy raw result data
FormulaPsi = (q-p)*log(q/p)+(p-q)*log((1-q)/(1-p))
Sources and model references

Made for real tasks

  • Compare the share of observations in two fixed bins between reference and current populations.
Explore step-by-step workflows →

Worked example

Inputs

Reference share in first bin
0.4 fraction
Current share in first bin
0.6 fraction

Expected results

Psi
0.1621860432 number

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

  1. Enter reference share in first bin, current share in first bin.
  2. Use the displayed units and confirm the model assumptions.
  3. Calculate and compare the outputs against your input scenario.

Try this example

{
  "p": 0.4,
  "q": 0.6
}

Accuracy and scope

Bins must be fixed across populations. No universal threshold or significance interpretation is applied.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.