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SP 225 Lecture 5. Percentages, Proportions, Rates of Change and Frequency Distributions. Proportion. The number of cases in one category of a variable divided by the number of cases in all categories of a variable. Rates. Definition: A proportion written with a base other than 1. Percentage.

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sp 225 lecture 5

SP 225Lecture 5

Percentages, Proportions, Rates of Change and Frequency Distributions

proportion
Proportion
  • The number of cases in one category of a variable divided by the number of cases in all categories of a variable
rates
Rates
  • Definition: A proportion written with a base other than 1
percentage
Percentage
  • Definition: a rate written with a base of 100
percentage change
Percentage Change
  • Definition: A statistic that tells how much a variable has changed over time.
frequency distribution
Frequency Distribution

Definition: A table that summarizes the distribution of a variable by reporting the number of cases contained in each of its categories

making decisions based on ordinal data
Making Decisions Based on Ordinal Data
  • Cannot truly calculate an average score
  • Cannot directly compare categories
frequency tables for interval ratio data
Frequency Tables for Interval/Ratio Data
  • Group categories
  • Groups represent ranges of values
constructing a frequency table
Constructing a Frequency Table
  • Decide upon a number of groups
  • Find the range of data by subtracting the minimum value from the maximum value
  • Divide the range by the number of groups to get the minimum group size
  • Define the lower limit of the lower interval and begin building the groupings
  • Count the number of cases in each group
example frequency table
Example Frequency Table

5 10 17 13

8 12 19 22

15 3 9 2

14 16 20 19

18 7 14 23

14 21 28 18

constructing a frequency table in spss
Constructing a Frequency Table in SPSS
  • Use recode command to group data
  • Groups must be created manually before frequency table is constructed
reading for next class
Reading For Next Class
  • No Additional Reading