Chapter 2 Organizing the Data

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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
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

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%)

Histogram of Distribution of Children

in Little Rock Community Survey

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