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Glass’s Delta Effect Size Calculator — result sheet
Calculate Glass’s delta using the control-group standard deviation as the reference scale.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Glass’s delta=(treatment mean−control mean)/control standard deviation.
The control group supplies the standardizing spread, which can be useful when treatment variability is expected to differ.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Treatment mean — minimum -1000000000000; maximum 1000000000000
- Control mean — minimum -1000000000000; maximum 1000000000000
- Control standard deviation — minimum 1.0E-6; maximum 1000000000000
Worked example
| Input | Value |
|---|---|
| Treatment mean | 82 |
| Control mean | 75 |
| Control standard deviation | 10 |
Glass’s delta =0.7.
Assumptions and limits
- Treatment and control means use the same measurement scale.
- The control standard deviation is positive and is the chosen reference spread.
- Sampling uncertainty, small-sample correction, and causal interpretation are not modeled.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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