Description
Calculate a supplied commuting-mode share with optional unknown-mode inclusion.
Geographic activity records depend on location precision, boundary vintage, observation time, population denominator and access-window conventions. A travel-time budget differs from actual accessibility, and rectangular cell area does not establish privacy. Local shares and labels need the original survey and spatial definitions.
Calculate a supplied commuting-mode share with optional unknown-mode inclusion.
When to use this tool
Use Commuting Mode Share Denominator when you already have modeCount, knownModeCount, unknownModeCount, includeUnknown and need to calculate a supplied commuting-mode share with optional unknown-mode inclusion.
How to use the tool and how it works
- Enter modeCount, knownModeCount, unknownModeCount, includeUnknown. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read denominator, modeShare, defined. Inspect defined before interpreting the associated values.
Require nonnegative safe whole known/unknown counts and modeCount within known. Denominator=known+(includeUnknown?unknown:0); share=mode/denominator, or zero with defined=false when denominator=0.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| modeCount | Mode Count | Required. Safe integer; minimum 0. |
| knownModeCount | Known Mode Count | Required. Safe integer; minimum 0. |
| unknownModeCount | Unknown Mode Count | Required. Safe integer; minimum 0. |
| includeUnknown | Include Unknown | Required. Boolean. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| denominator | knownModeCount plus unknownModeCount only when selected; resulting count must remain a safe integer. | Required. Safe integer. |
| modeShare | Mode Share | Required. Finite number. |
| defined | False when denominator=0, with modeShare=0 placeholder. | Required. Boolean. |
{
"input": {
"modeCount": 30,
"knownModeCount": 100,
"unknownModeCount": 20,
"includeUnknown": true
},
"output": {
"denominator": 120,
"modeShare": 0.25,
"defined": true
}
}Limitations and assumptions
- Unsafe integer denominators are rejected. Unknown-count inclusion is a supplied policy, not a verified survey denominator or actual mode classification.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Use the actual route, service schedule, survey frame and boundary source when assessing mobility or access. Review disclosure across the full spatial dataset and linked records; a location label or cell-size product is not a complete privacy method.
References
Similar or alternative tools
- Geographic Survey Urban Rural Source Key
Record a supplied urban/rural classification and source.
- Commute Transfer Wait Share
Calculate transfer-waiting time as a share of supplied commute time.