Estimated stability coefficient for IQ — estimated

Uses best fitting model of general ability from Table 3 from Breit, M., Scherrer, V., Tucker-Drob, E. M., & Preckel, F. (2024). The stability of cognitive abilities: A meta-analytic review of longitudinal studies. Psychological Bulletin. https://doi.org/10.1037/bul0000425

Usage

estimated_stability(
  age,
  interval,
  different_battery_family = FALSE,
  b0 = 0.716,
  b1 = 0.003,
  b2 = -0.258,
  b3 = 0,
  b4 = -0.095,
  b5 = -0.138,
  b6 = -0.104
)

Arguments

age: age at initial testing
interval: year between tests
different_battery_family: different battery family (e.g., WAIS and Stanford-Binet). Defaults to FALSE, meaning either the same test or test from the same battery family (e.g., WISC and WAIS))
b0: Horizontal asymptote
b1: Age scaling factor
b2: Age growth rate
b3: Interval-age interaction
b4: Interval scaling factor
b5: Interval growth rate
b6: Different battery family effect

Value

a correlation stability coefficient

Examples

estimated_stability(
  age = 12,
  interval = 6,
  different_battery_family = TRUE
)
#> [1] 0.6711221