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Acock - A Gentle Introduction to Stata

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Acock A Gentle Introduction to Stata
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Alan C. Acocks A Gentle Introduction to Stata, Fifth Edition, is aimed at new Stata users who want to become proficient in Stata. After reading this introductory text, new users will be able not only to use Stata well but also to learn new aspects of Stata. Acock assumes that the user is not familiar with any statistical software. This assumption of a blank slate is central to the structure and contents of the book. Acock starts with the basics; for example, the portion of the book that deals with data management begins with a careful and detailed example of turning survey data on paper into a Stata-ready dataset on the computer. When explaining how to go about basic exploratory statistical procedures, Acock includes notes that will help the reader develop good work habits. This mixture of explaining good Stata habits and good statistical habits continues throughout the book. Acock is quite careful to teach the reader all aspects of using Stata. He covers data management, good work habits (including the use of basic do-files), basic exploratory statistics (including graphical displays), and analyses using the standard array of basic statistical tools (correlation, linear and logistic regression, and parametric and nonparametric tests of location and dispersion). He also successfully introduces some more advanced topics such as multiple imputation and structural equation modeling in a very approachable manner. Acock teaches Stata commands by using the menus and dialog boxes while still stressing the value of do-files. In this way, he ensures that all types of users can build good work habits. Each chapter has exercises that the motivated reader can use to reinforce the material. The tone of the book is friendly and conversational without ever being glib or condescending. Important asides and notes about terminology are set off in boxes, which makes the text easy to read without any convoluted twists or forward-referencing. Rather than splitting topics by their Stata implementation, Acock arranges the topics as they would appear in a basic statistics textbook; graphics and postestimation are woven into the material in a natural fashion. Real datasets, such as the General Social Surveys from 2002 and 2006, are used throughout the book. The focus of the book is especially helpful for those in the behavioral and social sciences because the presentation of basic statistical modeling is supplemented with discussions of effect sizes and standardized coefficients. Various selection criteria, such as semipartial correlations, are discussed for model selection. Acock also covers a variety of commands available for evaluating reliability and validity of measurements. The fifth edition of the book includes two new chapters that cover multilevel modeling and item response theory (IRT) models. The multilevel modeling chapter demonstrates how to fit linear multilevel models using the mixed command. Acock discusses models with both random intercepts and random coefficients, and he provides a variety of examples that apply these models to longitudinal data. The IRT chapter introduces the use of IRT models for evaluating a set of items designed to measure a specific trait such as an attitude, value, or a belief. Acock shows how to use the irt suite of commands, which are new in Stata 14, to fit IRT models and to graph the results. In addition, he presents a measure of reliability that can be computed when using IRT.

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A Gentle Introduction to Stata 5th Edition ALAN C ACOCK Oregon State - photo 1

A Gentle Introduction to Stata

5th Edition

ALAN C. ACOCK Oregon State University

Picture 2

A Stata Press Publication StataCorp LP College Station, Texas

Picture 3
Copyright 2006, 2008, 2010, 2012, 2014, 2016 by StataCorp LP
All rights reserved. First edition 2006
Second edition 2008
Third edition 2010
Revised third edition 2012
Fourth edition 2014
Fifth edition 2016

Published by Stata Press, 4905 Lakeway Drive, College Station, Texas 77845

Typeset in L A T E X Picture 4

Printed in the United States of America

Print ISBN-10: 1-59718-185-4

Print ISBN-13: 978-1-59718-185-3

ePub ISBN-10: 1-59718-186-2

ePub ISBN-13: 978-1-59718-186-0

Mobi ISBN-10: 1-59718-187-0

Mobi ISBN-13: 978-1-59718-187-7

Library of Congress Control Number: 2016935690

No part of this book may be reproduced, stored in a retrieval system, or transcribed, in any form or by any meanselectronic, mechanical, photocopy, recording, or otherwisewithout the prior written permission of StataCorp LP.

Stata, Picture 5 , Stata Press, Mata, Picture 6 , and NetCourse are registered trademarks of StataCorp LP.

Stata and Stata Press are registered trademarks with the World Intellectual Property Organization of the United Nations.

L A T E X Picture 7 is a trademark of the American Mathematical Society.

Contents


1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8

2.1
2.2
2.3
2.4
2.4.1
2.5
2.6
2.7
2.8
2.9
2.10

3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9

4.1
4.2
4.3
4.4
4.5
4.6
4.7

5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8

6.1
6.2
6.3
6.3.1
6.3.2
6.4
6.5
6.6
6.7
6.8
6.9
6.10
6.11

7.1
7.2
7.3
7.4
7.5
7.6
7.7
7.8
7.8.1
7.9
7.10
7.11
7.11.1
7.11.2
7.12
7.13
7.14

8.1
8.2
8.3
8.4
8.5
8.6
8.7
8.8
8.9
8.10

9.1
9.2
9.3
9.4
9.5
9.6
9.7
9.8
9.9
9.10
9.10.1
9.10.2
9.10.3
9.10.4
9.11
9.12

10.1
10.2
10.3
10.4
10.5
10.6
10.7
10.7.1
10.7.2
10.7.3
10.8
10.9
10.10
10.11
10.12
10.12.1
10.12.2
10.12.3
10.13
10.14
10.15

11.1
11.2
11.3
11.3.1
11.3.2
11.4
11.5
11.6
11.6.1
11.6.2
11.7
11.8
11.9
11.10
11.11
11.12

12.1
12.2
12.2.1
12.3
12.3.1
12.3.2
12.3.3
12.3.4
12.3.5
12.4
12.4.1
12.4.2
12.4.3
12.5
12.6
12.6.1
12.6.2
12.7
12.7.1
12.8
12.9

13.1
13.2
13.3
13.4
13.5
13.5.1
13.5.2
13.5.3
13.5.4
13.5.5
13.6
13.7

14.1
14.1.1
14.2
14.2.1
14.3
14.3.1
14.3.2
14.4
14.5
14.6

15.1
15.2
15.3
15.4
15.5
15.5.1
15.5.2
15.6
15.7
15.7.1
15.7.2
15.7.3
15.8
15.9
15.10
15.11

16.1
16.2
16.2.1
16.2.2
16.2.3
16.3
16.3.1
16.3.2
16.3.3
16.3.4
16.4
16.4.1
16.5
16.5.1
16.5.2
16.5.3
16.6
16.7
16.8
16.9
A
A.1
A.2
A.2.1
A.2.2
A.2.3
A.2.4
A.2.5
A.3
Figures
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
1.10
1.11
1.12
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
2.10
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
4.1
4.2
4.3
4.4
4.5
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.9
5.10
5.11
5.12
5.13
5.14
5.15
6.1
6.2
6.3
6.4
6.5
6.6
7.1
7.2
7.3
7.4
7.5
8.1
8.2
8.3
8.4
8.5
8.6
8.7
8.8
8.9
8.10
8.11
9.1
9.2
9.3
9.4
9.5
9.6
9.7
9.8
9.9
9.10
9.11
10.1
10.2
10.3
10.4
10.5
10.6
10.7
10.8
10.9
10.10
10.11
10.12
10.13
10.14
10.15
10.16
11.1
11.2
11.3
11.4
11.5
11.6
11.7
12.1
14.1
14.2
14.3
14.4
14.5
14.6
14.7
14.8
14.9
14.10
14.11
14.12
14.13
14.14
14.15
14.16
14.17
14.18
14.19
15.1
15.2
15.3
15.4
15.5
15.6
15.7
15.8
15.9
15.10
15.11
16.1
16.2
16.3
16.4
16.5
16.6
16.7
16.8
16.9
16.10
16.11
16.12
16.13
16.14
16.15
16.16
A.1
A.2
A.3
Tables
2.1
3.1
4.1
5.1
9.1
9.2
10.1
10.2
12.1
12.2
12.3
14.1
14.2
16.1
16.2
Boxed tips

Preface

This book was written with a particular reader in mind. This reader is learning socialstatistics and needs to learn Stata but has no prior experience with other statistical softwarepackages. When I learned Stata, I found there were no books written explicitly for this type ofreader. There are certainly excellent books on Stata, but they assume extensive priorexperience with other packages, such as SAS or IBM SPSS Statistics; they also assume a fairlyadvanced working knowledge of statistics. These books moved quickly to advanced topicsand left my intended reader in the dust. Readers who have more background instatistical software and statistics will be able to read chapters quickly and evenskip sections. The goal is to move the true beginner to a level of competence usingStata.

With this target reader in mind, I make far more use of the menus and dialog boxes inStatas interface than do any other books about Stata. Advanced users may not see the valuein using the interface, and the more people learn about Stata, the less they will rely on theinterface. Also, even when you are using the interface, it is still important to save a record ofthe sequence of commands you run. Although I rely on the commands much more than thedialog boxes in the interface in my own work, I still find value in the interface. The dialogboxes in the interface include many options that I might not have known or might haveforgotten.

To illustrate the interface as well as graphics, I have included more than 100 figures, manyof which show dialog boxes. I present many tables and extensive Stata results as theyappear on the screen. I interpret these results substantively in the belief that beginning Statausers need to learn more than just how to produce the resultsusers also need to be able tointerpret them.

I have tried to use real data. There are a few examples where it is much easier to illustratea point with hypothetical data, but for the most part, I use data that are in the publicdomain. For example, I use the General Social Surveys for 2002 and 2006 in many chapters, aswell as the National Survey of Youth, 1997. I have simplified the files by dropping many of thevariables in the original datasets, but I have kept all the observations. I have tried to useexamples from several social-science fields, and I have included a few extra variables in several datasets so that instructors, as well as readers, can make additional examples and exercises that are tailored to their disciplines. People who are used to working with statistics books that have contrived data with just a few observations, presumably so work can be done by hand, may be surprised to see more than 1,000 observations in this books datasets. Working with these files provides better experience for other real-world data analysis. If you have your own data and the dataset has a variety of variables, you may want to use your data instead of the data provided with this book.

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