CRIM 320 Lecture Notes - Lecture 3: Level Of Measurement, Standard Score, Central Tendency

• School: Simon Fraser University
• Department: Criminology
• Course: CRIM 320
• Professor: Martin Andresen

Document Summary

Summarizes info about the most typical/central/middle/common scores of a variable. Often used to generalize or compare values across pops. Most often used with nominal level variables. Can only be used with ordinal data when . Can be used with interval & ratio data without restriction. There is an odd number of cases. There are a number of ties in an event number of cases. 3 measures of central tendency: mode, median, mean. Should only be used with interval/ratio data. Sum of scores divided by the total number of obs. Variety, diversity, amount of variation between scores. The greater the dispersion of a variable . The less useful the measure of central tendency becomes. Measures distance between highest and lowest value. It reveals more than the different between the highest and lowest scores. It shows how far the average observation is from the mean. Average distance each variable is from the class mean. Useful for determining how typical" a variable is.