# Chapter 2 Organizing the Data - PowerPoint PPT Presentation

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Chapter 2 Organizing the Data. Nominal Data and Distributions. Frequency distribution of nominal data consists of two columns: Left column has characteristics (e.g., Response of Child) Right column has frequency ( f ). Comparing Distributions. Comparisons clarify and add information.

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Chapter 2 Organizing the Data

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### Nominal Data and Distributions

• Frequency distribution of nominal data consists of two columns:

• Left column has characteristics (e.g., Response of Child)

• Right column has frequency (f)

### Comparing Distributions

• Comparisons clarify and add information

### Rate of Change

• Compare the same population at two points in time

• Rate of Change =

time 2f – time1f

time 1f

(100)*

1Source: National Crime Victimization Survey

N = 77688

Pie Chart

### Bar Graph

Histogram of Distribution of Children

in Little Rock Community Survey

### Frequency Polygon Example

Number of Adolescents (< 18 y/o)

Using for the First Time by Month

### Kurtosis

Leptokurtic

Platykurtic

Mesokurtic

Some Variation in Kurtosis among Symmetrical Distributions

### Skewness

Negatively skewed

Positively skewed

Symmetrical

(Normal)

Three Distributions Representing Direction of Skewness