THE NUMBERS, EXPLAINED
How to use this calculator.
Descriptive means include successful trials only; groups need not have equal sample sizes. No statistical significance or causal inference is reported.
Start with your inputs
Enter group a task durations (seconds), group a completion flags (0 or 1), group b task durations (seconds), group b completion flags (0 or 1). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Group A task durations (seconds) | 10,20,30 |
| Group A completion flags (0 or 1) | 1,1,0 |
| Group B task durations (seconds) | 15,25 |
| Group B completion flags (0 or 1) | 1,1 |
A worked example
With the example inputs above, group a mean successful time (seconds) is 15. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Group A mean successful time (seconds) | 15 |
| Group B mean successful time (seconds) | 20 |
| Group B minus group A mean (seconds) | 5 |
| Successful trial sample sizes | 2, 2 |
How this is calculated
Group A mean successful time (seconds)
Average durations where group A completion flag is one.
Group B mean successful time (seconds)
Average durations where group B completion flag is one.
Group B minus group A mean (seconds)
Subtract the successful-trial group means.
Successful trial sample sizes
Report included count for each group.
Symbols and units
- a
- Group A task durations (seconds)
- b
- Group A completion flags (0 or 1)
- c
- Group B task durations (seconds)
- d
- Group B completion flags (0 or 1)
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions and limits
Descriptive means include successful trials only; groups need not have equal sample sizes. No statistical significance or causal inference is reported.
Calculations use the values you enter. Blank or invalid inputs show an error instead of silently substituting zero. Results are displayed to useful precision; calculations retain the underlying numeric precision.
Questions about this tool
What does the result tell me?
Group A mean successful time (seconds); Group B mean successful time (seconds); Group B minus group A mean (seconds); Successful trial sample sizes. The result applies to the method and inputs described above. Check the units and assumptions before using it in a decision.
Why might another calculator differ?
Differences in units, rounding, timing or model definitions can produce different answers. Compare the input definitions and the method, rather than only the final number. For this tool: Descriptive means include successful trials only; groups need not have equal sample sizes. No statistical significance or causal inference is reported.
Are my inputs stored or sent to AI?
Calculations on this page happen in your browser. The separate AI question finder sends its submitted conversation to OpenAI; these calculator fields are not sent. Favourites and recent tool names are stored locally. A shared link contains the inputs you choose to include.
Further reading
Background reading; this does not imply endorsement or independent review of SumFizz.
Review status
Software example and browser checks are recorded in our quality report. No external expert review is claimed. Created with coding assistance; calculations run as ordinary browser code.
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