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SP 225 Lecture 5

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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

- No Additional Reading