PSY 207 Lecture Notes - Lecture 2: Frequency Distribution, Bar Chart, Frequency (Statistics)
Document Summary
Reveals characteristics of the data not obvious in the raw scores. One of the most effect ways tell others about you data. Sorted collection of observations showing the number of times (or frequency) each observation occurs. If numerical, rank order (usually form highest to lowest) X = score type (could be categorical or numerical) f = frequency of occurrence. Allows us to look at two categorical variables simultaneously: marginal distribution is depicted in the total columns. Two ways: recreate the original set of scores and sum them up, multiply each score (x) with its frequency (f ) and then add up the resulting values. If scores cover a wide range, it is unreasonable to use an ungrouped frequency table. Rows = highest lowest +1 96-41+1 = 56! In cases like these, we use a grouped frequency table in which scores are grouped into class intervals.
