Description
hostEmergenceFraction = emergedHosts/exposedHosts; parasitoidsPerEmergingHost = parasitoids/emergedHosts.
Entomological counts can refer to individuals, hosts, marker grains or a known cohort. Ratios are meaningful only when numerator and denominator describe compatible observations; an absent denominator differs from an observed zero proportion.
hostEmergenceFraction = emergedHosts/exposedHosts; parasitoidsPerEmergingHost = parasitoids/emergedHosts.
When to use this tool
Use Parasitoid Emergence Host Count Share when checking a supplied count ratio or cohort balance.
How to use the tool and how it works
- Enter emergedHosts, exposedHosts, parasitoids. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read hostEmergenceFraction, parasitoidsPerEmergingHost. Use the output convention below.
Require whole exposedHosts >= emergedHosts >= 1 and whole parasitoids >= emergedHosts. hostEmergenceFraction = emergedHosts/exposedHosts; parasitoidsPerEmergingHost = parasitoids/emergedHosts.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| emergedHosts | Emerged Hosts | Required. Safe integer; minimum 1. |
| exposedHosts | Exposed Hosts | Required. Safe integer; minimum 1. |
| parasitoids | Parasitoids | Required. Safe integer. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| hostEmergenceFraction | Host Emergence Fraction | Required. Finite number. |
| parasitoidsPerEmergingHost | Parasitoids Per Emerging Host | Required. Finite number. |
{
"input": {
"emergedHosts": 20,
"exposedHosts": 50,
"parasitoids": 60
},
"output": {
"hostEmergenceFraction": 0.4,
"parasitoidsPerEmergingHost": 3
}
}Limitations and assumptions
- Hosts with emergence and individual parasitoid counts use different denominators. Zero emergence is rejected; parasitism, survival and detection are not separately estimated.
- 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 appropriate counting, subsampling and recovery methods for inference beyond these supplied counts.
References
Similar or alternative tools
- Insect Emergence Cumulative One Day Term
Return cumulative as that sum, fraction = cumulative/expectedTotal and remaining = expectedTotal-cumulative.
- Insect Count Subsample Share
share = subsampleCount/totalCount when totalCount > 0; otherwise return share = 0 and defined = false.