netfacs.reciprocity {NetFACS}

Calculate reciprocity of probabilities that two elements appear together

Description

For all dyadic combinations that ever appear, this function calculates how reciprocal the conditional probabilities (i.e. probability of A given B, and B given A) of the two elements are. Combinations that are highly reciprocal indicate that the two elements always occur together and might represent a fixed combination, while low reciprocity might indicate that one element is an extension of the other. Values approaching -1 indicate that one element is strongly dependent on the other, but this is not reciprocated; values around 0 indicate that neither is conditional on the other; and values approaching 1 indicate that both values are conditional on each other. If P[A|B] is the larger conditional probability, the reciprocity is calculated as reciprocity = ((P[B|A]/P[A|B]) - (P[A|B] - P[B|A])) * P[A|B].

Usage

netfacs.reciprocity(netfacs.data)

Arguments

netfacs.data

object resulting from netfacs() function

Value

Function returns a data frame with each combination, the reciprocity of conditional occurrence from -1 (one element entirely depends on the other, but not vice versa) to 1 (both elements always occur together)

The directions and conditional probabilities of both elements are also returned

Examples

### how do angry facial expressions differ from non-angry ones?
data(emotions_set)
angry.face <- netfacs(
  data = emotions_set[[1]],
  condition = emotions_set[[2]]$emotion,
  test.condition = "anger",
  ran.trials = 100,
  combination.size = 2
)

netfacs.reciprocity(angry.face)