Sp 225 lecture 5
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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

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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


Frequency distribution1

Frequency Distribution


Frequency distribution with percentages

Frequency Distribution with Percentages


Frequency distribution with cumulative frequency

Frequency Distribution with Cumulative Frequency


Frequency distribution with cumulative percentages

Frequency Distribution with Cumulative Percentages


Frequency tables spss

Frequency Tables SPSS


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

5101713

8121922

15392

14162019

1871423

14212818


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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