Description
Return one inverse-variance review weight and contribution.
Research effect estimates depend on outcome definitions, unit conversions, orientation and statistical assumptions. A written rounding envelope describes reporting precision; an effect-size contribution or supplied interval is different from a fitted analysis, a confidence statement or evidence of clinical benefit.
Return one inverse-variance review weight and contribution.
When to use this tool
Use Chiropractic Review Weight One Study when checking the stated effect-size, measurement or interval convention.
How to use the tool and how it works
- Enter effect, variance, betweenVariance, totalWeight. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read weight, normalizedWeight, contribution. Use the output convention below.
Return one inverse-variance review weight and contribution. Require variance > 0, betweenVariance >= 0 and totalWeight > 0; weight = 1/(variance+betweenVariance), normalizedWeight = weight/totalWeight, contribution = effect*normalizedWeight.1
Inverse-variance aggregation weights estimates by their precision. A supplied between-study variance changes random-effects weights; one weighted contribution is not a complete fitted analysis.2
| Input field | Meaning and units | Accepted input |
|---|---|---|
| effect | Effect | Required. Finite number. |
| variance | Variance | Required. Finite number; strictly above 0. |
| betweenVariance | Supplied nonnegative between-study variance on the squared effect scale. | Required. Finite number; minimum 0. |
| totalWeight | Positive supplied sum of review weights; it is not fitted from a study collection here. | Required. Finite number; strictly above 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| weight | Caller-supplied weight on the stated observation, model or allocation basis. | Required. Finite number. |
| normalizedWeight | Normalized Weight | Required. Finite number. |
| contribution | Contribution | Required. Finite number. |
{
"input": {
"effect": 0.4,
"variance": 0.04,
"betweenVariance": 0.01,
"totalWeight": 100
},
"output": {
"weight": 20,
"normalizedWeight": 0.2,
"contribution": 0.08
}
}Limitations and assumptions
- The total weight and heterogeneity variance are supplied; this is one summand rather than a fitted or clinically valid meta-analysis.
- 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 a complete, justified statistical analysis and original study data; distinguish reporting precision from sampling uncertainty and assess clinical relevance independently.
References
Similar or alternative tools
- Chiropractic Study Effect Size One Contrast
Return a corrected standardized mean contrast and its orientation.
- Chiropractic Review Effect Estimate Rounding Envelope Tool
Envelope an explicitly rounded effect estimate, separate from statistical uncertainty.