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# SP 225 Lecture 5 - PowerPoint PPT Presentation

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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## PowerPoint Slideshow about 'SP 225 Lecture 5 ' - jena

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### SP 225Lecture 5

Percentages, Proportions, Rates of Change and Frequency Distributions

• The number of cases in one category of a variable divided by the number of cases in all categories of a variable

• Definition: A proportion written with a base other than 1

• Definition: a rate written with a base of 100

• Definition: A statistic that tells how much a variable has changed over time.

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

• Cannot truly calculate an average score

• Cannot directly compare categories

• Group categories

• Groups represent ranges of values

• 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

5101713

8121922

15392

14162019

1871423

14212818

• Use recode command to group data

• Groups must be created manually before frequency table is constructed