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# Chapter 2 Organizing the Data - PowerPoint PPT Presentation

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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Presentation Transcript
Chapter 2Organizing the Data

• Frequency distribution of nominal data consists of two columns:

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

• Right column has frequency (f)

• Comparisons clarify and add information

• 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

Cross Tabulations – Victim-Offender Relationship by Gender of Victim for Homicides in US for 2005 (With Row%)

Cross Tabulations – Victim-Offender Relationship by Gender of Victim for Homicides in US for 2005 (With Row%)

Cross Tabulations – Victim-Offender Relationship by Gender of Victim for Homicides in US for 2005 (With Row%)

Cross Tabulations – Victim-Offender Relationship by Gender of Victim for Homicides in US for 2005 (With Row%)

Pie Chart of Victim for Homicides in US for 2005 (With Row%)

Exploded Pie Chart of Victim for Homicides in US for 2005 (With Row%)

Bar Graph of Victim for Homicides in US for 2005 (With Row%)

Histogram of Distribution of Children of Victim for Homicides in US for 2005 (With Row%)

in Little Rock Community Survey

Frequency Polygon Example of Victim for Homicides in US for 2005 (With Row%)

Number of Adolescents (< 18 y/o) of Victim for Homicides in US for 2005 (With Row%)

Using for the First Time by Month

Kurtosis of Victim for Homicides in US for 2005 (With Row%)

Leptokurtic

Platykurtic

Mesokurtic

Some Variation in Kurtosis among Symmetrical Distributions

Skewness of Victim for Homicides in US for 2005 (With Row%)

Negatively skewed

Positively skewed

Symmetrical

(Normal)

Three Distributions Representing Direction of Skewness