Description
Return events per observed day, contact-day share, and events per contact day.
Research time coordinates can represent age, residence, observation, or follow-up. Fixed year lengths and censored intervals are modeling conventions; an unfinished observation supplies less timing information than a completed event.
Return events per observed day, contact-day share, and events per contact day.
When to use this tool
Use Older Adult Social Contact Day Rate when you need an ageing-research interval calculation with an explicit time basis.
How to use the tool and how it works
- Enter contactEvents, observedDays, contactDays. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read eventsPerDay, contactDayFraction, eventsPerContactDay. Use the output convention below.
Require positive observedDays, integer contactDays from one through observedDays, and contactEvents at least contactDays. Return events per observed day, contact-day share, and events per contact day.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| contactEvents | Contact Events | Required. Safe integer. |
| observedDays | Observed Days | Required. Finite number; strictly above 0. |
| contactDays | Contact Days | Required. Safe integer; minimum 1. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| eventsPerDay | Events Per Day | Required. Finite number. |
| contactDayFraction | Contact Day Fraction | Required. Finite number. |
| eventsPerContactDay | Events Per Contact Day | Required. Finite number. |
{
"input": {
"contactEvents": 20,
"observedDays": 10,
"contactDays": 5
},
"output": {
"eventsPerDay": 2,
"contactDayFraction": 0.5,
"eventsPerContactDay": 4
}
}Limitations and assumptions
- The contract excludes zero contact days and no social-health threshold is selected; contact definitions, quality, completeness, and wellbeing are not assessed.
- 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 actual calendar dates for calendar age and an appropriate censoring-aware analysis for incomplete follow-up. Verify origin, units, and event definitions against the study protocol.
References
Similar or alternative tools
- Older Adult Diary Simultaneous Activity Share
Validate nonnegative primary, secondary, and simultaneous durations with overlap within each and their union within positive observedMinutes.
- Older Adult Proxy Window Credit
Return direct minutes alone or add proxy minutes minus their shared overlap when countProxy.