Description
Compute stratumRate = events/stratumPopulation and weightedRate = standardWeight*stratumRate.
Standardization separates population composition from event frequency. Direct standardization weights stratum-specific rates; indirect standardization applies reference rates to study populations to form expected counts. A single term is only part of either full calculation.
Compute stratumRate = events/stratumPopulation and weightedRate = standardWeight*stratumRate.
When to use this tool
Use Direct Standardization One Stratum Term when checking one supplied standardization contribution and its declared population and rate basis.
How to use the tool and how it works
- Enter events, stratumPopulation, standardWeight. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read stratumRate, weightedRate. Use the output convention below.
Require nonnegative whole events, positive stratumPopulation and standardWeight in [0,1]. Compute stratumRate = events/stratumPopulation and weightedRate = standardWeight*stratumRate. Rates are events per one population unit; weights are fractions, not percentages.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| events | Events | Required. Safe integer; minimum 0. |
| stratumPopulation | Stratum Population | Required. Finite number; strictly above 0. |
| standardWeight | Standard Weight | Required. Finite number; minimum 0; maximum 1. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| stratumRate | Stratum Rate | Required. Finite number. |
| weightedRate | Weighted Rate | Required. Finite number. |
{
"input": {
"events": 10,
"stratumPopulation": 1000,
"standardWeight": 0.2
},
"output": {
"stratumRate": 0.01,
"weightedRate": 0.002
}
}Limitations and assumptions
- This returns one direct-standardization contribution. A complete rate requires compatible strata and weights summing to one; this tool neither checks a full weight set nor estimates uncertainty.
- 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
Assemble all comparable strata and suitable weights or reference rates before interpreting a complete standardized estimate.
References
Similar or alternative tools
- Indirect Standardization One Expected Count
Compute expectedCount = studyPopulation*referenceRate and observedExpectedRatio = observedCount/expectedCount.
- Population Attributable One Exposure Term Tool
Levin population attributable fraction under a single binary exposure and an applicable causal relative risk supplied externally.