SOC202H1 Lecture Notes - Lecture 3: Programmable Calculator, Standard Score, Standard Deviation
Document Summary
Measures of dispersion contd: index of qualitative variation cont"d. To complete the calculation, we will need to follow these steps: find percentages for each category, square the percentages, sum the squared percentages, plug the values into the iqv formula, range. Another quick and easy indication of variability. R can be used for ordinal or interval ratio variables. But there are some distinct limitations because it is based on only two scores. Range is distorted by atypically high or low scores: interquartile range (iqr) The iqr (also q) is a specialized way of capturing the range of a variable. It avoids the problem of very low or very high outlying values that plague the general range statistic. Rather than telling us thee full range, it describes dispersion by telling us the distance between the 75th percentile (quartile 3) and the 25th percentile (quartile 1) or the distributions. Percentile: a score below which a specific percentage of the distribution falls.
