Chapter 2 organizing the data
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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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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


Illustration gender of students majoring in cj f

Illustration: Gender of Students Majoring in CJ(f)


Illustration gender of students majoring in cj f and

Illustration: Gender of Students Majoring in CJ (f and %)


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


Ordinal interval data and distributions

Ordinal/Interval Data and Distributions


Grouped frequency distributions of interval data

Grouped Frequency Distributions of Interval Data


Flexible class intervals

Flexible Class Intervals

N = 77688


Grouped frequency distributions of interval data1

Grouped Frequency Distributions of Interval Data


Grouped frequency distributions of interval data2

Grouped Frequency Distributions of Interval Data


Chapter 2 day 2

Chapter 2 Day 2


Cross tab

Cross-tab


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


Exploded pie chart

Exploded Pie Chart


Bar graph

Bar Graph


Chapter 2 organizing the data

Histogram of Distribution of Children

in Little Rock Community Survey


Frequency polygon example

Frequency Polygon Example


Chapter 2 organizing the data

Number of Adolescents (< 18 y/o)

Using for the First Time by Month


Kurtosis

Kurtosis

Leptokurtic

Platykurtic

Mesokurtic

Some Variation in Kurtosis among Symmetrical Distributions


Skewness

Skewness

Negatively skewed

Positively skewed

Symmetrical

(Normal)

Three Distributions Representing Direction of Skewness


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