candy: correlation covariance matrix of binary data

In hvongbg/bindabox: Toolbox for fixed-links modelling

correlation covariance matrix of binary data

Description

the function calculates for each row, the probability of correct anwsers for each item and the probabilties for correct answers for the combination any of two items. then these probabilties are used to create the correltaion and covariance matrix – necessary to calcualte fixed-link models in SEM

Usage

candy(my_data, output_matrix, Item_SD)

Arguments

my_data	my_data is the dataframe entered, containing only the binary data and no ID numbers. Must be a df or matrix
output_matrix	the matrix created with default name output_matrix unless other name is provided
Item_SD	object is a list of SD of the propability of answering any two items correct

Value

output_matrix – matrix containing calcualted values Item_SD – list of SD

Note

goal is to create a toolbox for handling binary data

Author(s)

Helene M. von Gugelberg

Examples

a <-c(1,0,0,1)
b <-c(1,1,0,0)
c <-c(1,1,1,1)
data <- as.data.frame(rbind(a, b, c)) #example data

candy(data) #call function

output_matrix #matrix with saved values

Item_SD #SD for each item

hvongbg/bindabox documentation built on Feb. 1, 2025, 5:30 p.m.