pchisqmix function

Chi-Squared Mixtures Distribution Function

The approximate null distribution of a likelihood ratio for 2 nested mixed models, where both fixed and random effects are tested simultaneously, is a very specific mixture of chi-square distributions. It depends on both the number of random effects and the number of fixed effects to be tested simultaneously. Note that this function is a copy of the pchisqmix function of the TcGSA package.

pchisqmix(quant, s, q, lower.tail = TRUE)

Arguments

• quant: a quantile
• s: number of fixed effects to be tested
• q: number of random effects to be tested
• lower.tail: logical. if TRUE (default), probabilities are $P[X<=x]$, otherwise $P[X>x]$.

Returns

a probability.