# hi: Frequency of hits or true positives (TP). In riskyr: Rendering Risk Literacy more Transparent

## Description

`hi` is the frequency of hits or true positives (`TP`) in a population of `N` individuals.

## Usage

 `1` ```hi ```

## Format

An object of class `numeric` of length 1.

## Details

Definition: `hi` is the frequency of individuals for which `Condition = TRUE` and `Decision = TRUE` (positive).

`hi` is a measure of correct classifications, not an individual case.

Relationships:

1. to probabilities: The frequency `hi` depends on the sensitivity `sens` (aka. hit rate or true positive rate, TPR) and is conditional on the prevalence `prev`.

2. to other frequencies: In a population of size `N` the following relationships hold:

• `N = cond.true + cond.false` (by condition)

• `N = dec.pos + dec.neg` (by decision)

• `N = dec.cor + dec.err` (by correspondence of decision to condition)

• `N = hi + mi + fa + cr` (by condition x decision)

`sens` is the probability of hits or hit rate `HR`; `num` contains basic numeric parameters; `init_num` initializes basic numeric parameters; `freq` contains current frequency information; `comp_freq` computes current frequency information; `prob` contains current probability information; `comp_prob` computes current probability information; `is_freq` verifies frequencies.
Other frequencies: `N`, `cond.false`, `cond.true`, `cr`, `dec.cor`, `dec.err`, `dec.neg`, `dec.pos`, `fa`, `mi`
Other essential parameters: `cr`, `fa`, `mi`, `prev`, `sens`, `spec`