cronbach

I’ve often wondered how many raters I need to sample to get reliable stimulus ratings. This will obviously depend on the stimuli and what they’re being rated for. If there is a lot of inter-rater variation or very little inter-stimulus variation, you will need more raters to generate mean ratings with any reliability.

This is a tutorial in progress on how to calculate Cronbach’s alphas using the psych package in R. library(tidyverse) library(psych) disgust <- read_csv("https://psyteachr.github.io/msc-data-skills/data/disgust.csv") SPSS Under the Analyze menu, choose Scale and Reliability Analysis.