Examples
Examples
Try the starting example
- Lap times in original order: seconds or minutes:seconds, up to milliseconds, comma-separated
- 1:00.000,1:02.000,1:01.000,1:03.000
- First laps excluded as supplied warm-up count
- 1
- Additional original 1-based lap indices excluded, comma-separated, or none
- none
- Included original lap indices
- 2, 3, 4
- Mean included lap time (seconds)
- 62
- Best included lap time (seconds)
- 61
- Sample standard deviation (seconds)
- 1
- Sample coefficient of variation (%)
- 1.612903
- OLS time trend per original lap index (seconds/lap)
- 0.5
- Observed included max-minus-min time (seconds)
- 2
Try another scenario
- Lap times in original order: seconds or minutes:seconds, up to milliseconds, comma-separated
- 1:00.000,1:02.000,1:01.000,1:03.000
- First laps excluded as supplied warm-up count
- 0
- Additional original 1-based lap indices excluded, comma-separated, or none
- none
- Included original lap indices
- 1, 2, 3, 4
- Mean included lap time (seconds)
- 61.5
- Best included lap time (seconds)
- 60
- Sample standard deviation (seconds)
- 1.290994
- Sample coefficient of variation (%)
- 2.099178
- OLS time trend per original lap index (seconds/lap)
- 0.8
- Observed included max-minus-min time (seconds)
- 3
Calculation method
Calculation method
Included original lap indices
Remove only explicit warm-up and extra indices; retain original indices for trend.
Mean included lap time (seconds)
Arithmetic mean included milliseconds/1000.
Best included lap time (seconds)
Smallest included duration.
Sample standard deviation (seconds)
Square root of centered sum of squares/(n−1), undefined below two included laps.
Sample coefficient of variation (%)
100×sample SD/mean.
OLS time trend per original lap index (seconds/lap)
Centered OLS seconds-versus-original-index slope, not a predicted next lap.
Observed included max-minus-min time (seconds)
Observed largest−smallest included duration, undefined when no laps remain.
Symbols and units
- a
- Lap times in original order: seconds or minutes:seconds, up to milliseconds, comma-separated
- b
- First laps excluded as supplied warm-up count
- c
- Additional original 1-based lap indices excluded, comma-separated, or none
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions & limits
Assumptions & limits
- A descriptive supplied-lap audit. Exclusions are user declarations; no automatic outlier removal, weather correction, rider assessment or riding/tuning advice is provided.
Are these inputs private?
These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.
Further reading
OpenStax: ratios, unit rates and supplied measurement arithmetic ↗
Background reading; this does not imply endorsement or independent review of SumFizz.