Description
Subtract transferredOut within oldPopulation and add nonnegative transferredIn for rebasedPopulation.
Population indicators depend on compatible boundaries, time periods, counted groups, and denominator choices. A share or density can change when exclusions or daytime populations change, even without arithmetic error.
Subtract transferredOut within oldPopulation and add nonnegative transferredIn for rebasedPopulation.
When to use this tool
Use Census Area Boundary Population Factor when you need one transparent population-accounting component.
How to use the tool and how it works
- Enter oldPopulation, transferredOut, transferredIn, newLandArea. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read rebasedPopulation, newDensity, netBoundaryChange. Use the output convention below.
Subtract transferredOut within oldPopulation and add nonnegative transferredIn for rebasedPopulation. Divide by positive newLandArea and return netBoundaryChange.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| oldPopulation | Old Population | Required. Finite number; minimum 0. |
| transferredOut | Transferred Out | Required. Finite number; minimum 0. |
| transferredIn | Transferred In | Required. Finite number; minimum 0. |
| newLandArea | New Land Area | Required. Finite number; strictly above 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| rebasedPopulation | Rebased Population | Required. Finite number. |
| newDensity | New Density | Required. Finite number. |
| netBoundaryChange | Net Boundary Change | Required. Finite number. |
{
"input": {
"oldPopulation": 10000,
"transferredOut": 1000,
"transferredIn": 2500,
"newLandArea": 50
},
"output": {
"rebasedPopulation": 11500,
"newDensity": 230,
"netBoundaryChange": 1500
}
}Limitations and assumptions
- Transfers describe boundary reassignment, not necessarily migration; population counts and land area must refer to compatible records and dates.
- 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
Review source definitions, geography, temporal alignment, and uncertainty before making a demographic or service-access conclusion.
References
Similar or alternative tools
- Migration Net Flow One Region Balance
Return births-deaths, arrivals-departures, and openingPopulation+births-deaths+arrivals-departures+signed reclassification, with other inputs nonnegative.
- Population Density Day Night Denominator
Divide nonnegative residentPopulation by positive landArea for nightDensity.