Human Blood Index HBI Host Preference Fraction Calculator
Compute the observed Human Blood Index HBI Host Preference Fraction Calculator fraction from explicit subset and total counts; not a transmission, survival or viability guarantee.
Description
Compute the observed Human Blood Index HBI Host Preference Fraction Calculator fraction from explicit subset and total counts; not a transmission, survival or viability guarantee.
A human blood index is a fraction of identified blood meals assigned to the human category. Its denominator must match the identification scope used in the study.
When to use this tool
Compute the observed Human Blood Index HBI Host Preference Fraction Calculator fraction from explicit subset and total counts; not a transmission, survival or viability guarantee.
- Prepare the supplied humanBloodMeals, identifiedBloodMeals fields for this operation.
- Compare the complete example with the representation used by your own input before carrying the result into another step.
How to use the tool and how it works
- Enter humanBloodMeals, identifiedBloodMeals. Use the exact text syntax, units and index conventions explained below.
- Run the tool. If input validation fails, correct the supplied fields before interpreting any result.
- Read result.humanBloodIndex, result.causalInference. Interpret false, null and empty lists using the distinctions below; they can be valid outputs.
Validate humanBloodMeals as a nonnegative integer subset of positive identifiedBloodMeals. Return their ratio from zero through one as humanBloodIndex and causalInference not-established.1
| Input field | Meaning and representation | Accepted input |
|---|---|---|
| humanBloodMeals | Observed subset count used as the numerator. | Nonnegative safe integer, no greater than identifiedBloodMeals |
| identifiedBloodMeals | Observed total count used as the denominator. | Positive safe integer, at least humanBloodMeals |
| Output field | Interpretation |
|---|---|
| result | Object containing the named outputs below. |
| result.humanBloodIndex | The human blood index value under the stated formula or text convention. |
| result.causalInference | Always not-established: a supplied sample proportion does not establish causation. |
{
"input": {
"humanBloodMeals": 2,
"identifiedBloodMeals": 10
},
"output": {
"result": {
"humanBloodIndex": 0.2,
"causalInference": "not-established"
}
}
}Limitations and assumptions
- The output is a fraction, not a percentage. Mixed or unidentified meals, assay error and sampling bias are not resolved, and no causal transmission conclusion is supplied.
- Every declared top-level field is required and unexpected fields are rejected. Numeric inputs must be finite; ordinary text fields are bounded to 8,192 UTF-16 code units, with tighter operation-specific limits where stated.
- Ordinary string lists have at most 128 entries of at most 128 code units each; numeric lists and matrices have separate bounded size checks. Nonfinite results and excessively large serialized outputs are rejected.
- Indexes are zero-based and spans have an exclusive end unless explicitly stated otherwise. A valid false, null or empty-list result is distinct from malformed input.
Alternative or Complementary methods
Combine recorded observations with a validated method, appropriate controls and the complete specimen context. Use original qualified references when reviewing species, stages or product information; a supplied-record match, sample ratio or historical flag is only the stated piece of evidence.
References
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