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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
Chapter 2Organizing the Data


Nominal data and distributions
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
Comparing Distributions

  • Comparisons clarify and add information




Rate of change
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









Chapter 2 organizing the data
Cross Tabulations – Victim-Offender Relationship by Gender of Victim for Homicides in US for 2005 (With Row%)


Chapter 2 organizing the data
Cross Tabulations – Victim-Offender Relationship by Gender of Victim for Homicides in US for 2005 (With Row%)


Chapter 2 organizing the data
Cross Tabulations – Victim-Offender Relationship by Gender of Victim for Homicides in US for 2005 (With Row%)


Chapter 2 organizing the data
Cross Tabulations – Victim-Offender Relationship by Gender of Victim for Homicides in US for 2005 (With Row%)


Chapter 2 organizing the data

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


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


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


Chapter 2 organizing the data

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

in Little Rock Community Survey


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


Chapter 2 organizing the data

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

Using for the First Time by Month


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

Leptokurtic

Platykurtic

Mesokurtic

Some Variation in Kurtosis among Symmetrical Distributions


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

Negatively skewed

Positively skewed

Symmetrical

(Normal)

Three Distributions Representing Direction of Skewness