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Independent Groups Standardized Difference Calculator — result sheet
Calculate the standardized mean difference between two independent groups using a pooled standard deviation.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: d=(meanA−meanB)/spooled; spooled=√[((nA−1)sA²+(nB−1)sB²)/(nA+nB−2)].
The pooled spread and signed standardized difference are shown so direction is not hidden by a label.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Group A mean — minimum -1000000000; maximum 1000000000
- Group B mean — minimum -1000000000; maximum 1000000000
- Group A standard deviation — minimum 0; maximum 1000000000
- Group B standard deviation — minimum 0; maximum 1000000000
- Group A sample size — minimum 2; maximum 1000000
- Group B sample size — minimum 2; maximum 1000000
Worked example
| Input | Value |
|---|---|
| Group A mean | 80 |
| Group B mean | 74 |
| Group A standard deviation | 10 |
| Group B standard deviation | 12 |
| Group A sample size | 30 |
| Group B sample size | 28 |
Pooled SD ≈11.0; Cohen's d ≈0.545.
Assumptions and limits
- Group summaries are independent, standard deviations are nonnegative, and sample sizes are whole numbers of at least two.
- The pooled-standard-deviation version of Cohen's d is used.
- Small-sample corrections, confidence intervals, heterogeneity, and practical importance 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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