Data Analysis with IBM SPSS Statistics

cover

Title Page

Copyright

Data Analysis with IBM SPSS Statistics

Credits

About the Authors

Acknowledgement

About the Reviewers

www.PacktPub.com

Why subscribe?

Customer Feedback

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Downloading the example code

Errata

Piracy

Questions

Installing and Configuring SPSS

The SPSS installation utility

Installing Python for the scripting

Licensing SPSS

Confirming the options available

Launching and using SPSS

Setting parameters within the SPSS software

Executing a basic SPSS session

Summary

Accessing and Organizing Data

Accessing and organizing data overview

Reading Excel files

Reading delimited text data files

Saving IBM SPSS Statistics files

Reading IBM SPSS Statistics files

Demo - first look at the data - frequencies

Variable properties

Variable properties - name

Variable properties - type

Variable properties - width

Variable properties - decimals

Variable properties - label

Variable properties - values

Variable properties - missing

Variable properties - columns

Variable properties - align

Variable properties - measure

Variable properties - role

Demo - adding variable properties to the Variable View

Demo - adding variable properties via syntax

Demo - defining variable properties

Summary

Statistics for Individual Data Elements

Getting the sample data

Descriptive statistics for numeric fields

Controlling the descriptives display order

Frequency distributions

Discovering coding issues using frequencies

Using frequencies to verify missing data patterns

Explore procedure

Stem and leaf plot

Boxplot

Using explore to check subgroup patterns

Summary

Dealing with Missing Data and Outliers

Outliers

Frequencies for histogram and percentile values

Descriptives for standardized scores

The Examine procedure for extreme values and boxplot

Detecting multivariate outliers

Missing data

Missing values in Frequencies

Missing values in Descriptives

Missing value patterns

Replacing missing values

Summary

Visually Exploring the Data

Graphs available in SPSS procedures

Obtaining bar charts with frequencies

Obtaining a histogram with frequencies

Creating graphs using chart builder

Building a scatterplot

Create a boxplot using chart builder

Summary

Sampling Subsetting and Weighting

Select cases dialog box

Select cases - If condition is satisfied

Example

If condition is satisfied combined with Filter

If condition is satisfied combined with Copy

If condition is satisfied combined with Delete unselected cases

The Temporary command

Select cases based on time or case range

Using the filter variable

Selecting a random sample of cases

Split File

Weighting

Summary