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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


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