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IQ test-retest worked example

Source: R/RetestIQ.R
RetestIQ.Rd

Equal signal and noise spreads of 15/sqrt(2) reproduce the observed IQ spread of 15 and a retest correlation of about 0.71.

Usage

RetestIQ()

Value

list(r, sigma_y).

References

Morin, D. J. (2016). Probability: For the Enthusiastic Beginner. Createspace. Eq (6.38).

Examples

RetestIQ()$r
#> [1] 0.7071068