Alan C. Acock's 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 onlyto use Stata well but also to learn new aspects of Stata.Acock assumes that the user is not familiar with any statisticalsoftware. This assumption of a blank slate is central to the structureand contents of the book. Acock starts with the basics; for example,the portion of the book that deals with data management begins with acareful and detailed example of turning survey data on paper into aStata-ready dataset on the computer. When explaining how to go aboutbasic exploratory statistical procedures, Acock includes notes thatwill help the reader develop good work habits. This mixture ofexplaining good Stata habits and good statistical habits continuesthroughout 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 ofbasic do-files), basic exploratory statistics (including graphicaldisplays), and analyses using the standard array of basic statisticaltools (correlation, linear and logistic regression, and parametric andnonparametric tests of location and dispersion). He also successfullyintroduces some more advanced topics such as multiple imputation andstructural equation modeling in a very approachable manner. Acockteaches Stata commands by using the menus and dialog boxes while stillstressing the value of do-files. In this way, he ensures that alltypes of users can build good work habits. Each chapter has exercisesthat the motivated reader can use to reinforce the material.The tone of the book is friendly and conversational without ever beingglib or condescending. Important asides and notes about terminologyare set off in boxes, which makes the text easy to read without anyconvoluted twists or forward-referencing. Rather than splitting topicsby their Stata implementation, Acock arranges the topics as they wouldappear in a basic statistics textbook; graphics and postestimation arewoven into the material in a natural fashion. Real datasets, such asthe General Social Surveys from 2002 and 2006, are usedthroughout the book.The focus of the book is especially helpful for those in thebehavioral and social sciences because the presentation of basicstatistical modeling is supplemented with discussions of effect sizesand standardized coefficients. Various selection criteria, such assemipartial correlations, are discussed for model selection. Acockalso covers a variety of commands available for evaluating reliabilityand validity of measurements.The fifth edition of the book includes two new chapters that covermultilevel modeling and item response theory (IRT) models. Themultilevel modeling chapter demonstrates how to fit linear multilevelmodels using the mixed command. Acock discusses models withboth random intercepts and random coefficients, and he provides avariety of examples that apply these models to longitudinal data. TheIRT chapter introduces the use of IRT models for evaluating a set ofitems 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 computedwhen using IRT.
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Getting started
Conventions
Introduction
The Stata screen
Using an existing dataset
An example of a short Stata session
Video aids to learning Stata
Summary
Exercises
Entering data
Creating a dataset
An example questionnaire
Developing a coding system
Entering data using the Data Editor
Value labels
The Variables Manager
The Data Editor (Browse) view
Saving your dataset
Checking the data
Summary
Exercises
Preparing data for analysis
Introduction
Planning your work
Creating value labels
Reverse-code variables
Creating and modifying variables
Creating scales
Save some of your data
Summary
Exercises
Working with commands, do-files, and results
Introduction
How Stata commands are constructed
Creating a do-file
Copying your results to a word processor
Logging your command file
Summary
Exercises
Descriptive statistics and graphs for one variable
Descriptive statistics and graphs
Where is the center of a distribution?
How dispersed is the distribution?
Statistics and graphs-unordered categories
Statistics and graphs-ordered categories and variables
Statistics and graphs-quantitative variables
Summary
Exercises
Statistics and graphs for two categorical variables
Relationship between categorical variables
Cross-tabulation
Chi-squared test
Degrees of freedom
Probability tables
Percentages and measures of association
Odds ratios when dependent variable has two categories
Ordered categorical variables
Interactive tables
Tables--linking categorical and quantitative variables
Power analysis when using a chi-squared test of significance
Summary
Exercises
Tests for one or two means
Introduction to tests for one or two means
Randomization
Random sampling
Hypotheses
One-sample test of a proportion
Two-sample test of a proportion
One-sample test of means
Two-sample test of group means
Testing for unequal variances
Repeated-measures t test
Power analysis
Nonparametric alternatives
Mann--Whitney two-sample rank-sum test
Nonparametric alternative: Median test
Video tutorial related to this chapter
Summary
Exercises
Bivariate correlation and regression
Introduction to bivariate correlation and regression
Scattergrams
Plotting the regression line
An alternative to producing a scattergram, binscatter
Correlation
Regression
Spearman's rho: Rank-order correlation for ordinal data
Power analysis with correlation
Summary
Exercises
Analysis of variance
The logic of one-way analysis of variance
ANOVA example
ANOVA example with nonexperimental data
Power analysis for one-way ANOVA
A nonparametric alternative to ANOVA
Analysis of covariance
Two-way ANOVA
Repeated-measures design
Intraclass correlation
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Produktdetaljer
ISBN
9781597181853
Publisert
2016-04-19
Utgave
5. utgave
Utgiver
Vendor
Stata Press
Vekt
1134 gr
Aldersnivå
05, U
Språk
Product language
Engelsk
Format
Product format
Heftet
Antall sider
546
Forfatter