R/univar_table_statistics.R

In CDM: Cognitive Diagnosis Modeling

## File Name: univar_table_statistics.R
## File Version: 0.02

univar_table_statistics <- function(freq, values=NULL)
{
    K <- length(freq)
    if (is.null(values)){
        values <- seq(0, K-1)
    }
    N <- sum(freq)
    probs <- freq / N
    M <- sum( probs * values)
    SD <- sqrt( sum( probs * values^2) - M^2 )
    #--- output
    res <- list(N=N, M=M, SD=SD)
    return(res)
}