Falissard Analysis of Questionnaire Data with R

1. Auflage 2011
ISBN: 978-1-4398-1767-4
Verlag: Taylor & Francis
Format: PDF
Kopierschutz: Adobe DRM (»Systemvoraussetzungen)

E-Book, Englisch, 280 Seiten

While theoretical statistics relies primarily on mathematics and hypothetical situations, statistical practice is a translation of a question formulated by a researcher into a series of variables linked by a statistical tool. As with written material, there are almost always differences between the meaning of the original text and translated text. Additionally, many versions can be suggested, each with their advantages and disadvantages.
Analysis of Questionnaire Data with R translates certain classic research questions into statistical formulations. As indicated in the title, the syntax of these statistical formulations is based on the well-known R language, chosen for its popularity, simplicity, and power of its structure. Although syntax is vital, understanding the semantics is the real challenge of any good translation. In this book, the semantics of theoretical-to-practical translation emerges progressively from examples and experience, and occasionally from mathematical considerations.

Sometimes the interpretation of a result is not clear, and there is no statistical tool really suited to the question at hand. Sometimes data sets contain errors, inconsistencies between answers, or missing data. More often, available statistical tools are not formally appropriate for the given situation, making it difficult to assess to what extent this slight inadequacy affects the interpretation of results. Analysis of Questionnaire Data with R tackles these and other common challenges in the practice of statistics.

Zielgruppe

Researchers and graduate students in statistics, social science, marketing, and epidemiology; researchers in other disciplines who use questionnaires.

Autoren/Hrsg.

Falissard, Bruno

Fachgebiete

• Sozialwissenschaften Psychologie Allgemeine Psychologie Differentielle Psychologie, Persönlichkeitspsychologie Psychologische Diagnostik, Testpsychologie
• Sozialwissenschaften Psychologie Psychologie / Allgemeines & Theorie Psychologische Forschungsmethoden
• Interdisziplinäres Wissenschaften Wissenschaften: Forschung und Information Datenanalyse, Datenverarbeitung
• Mathematik | Informatik Mathematik Stochastik Mathematische Statistik
• Mathematik | Informatik EDV | Informatik Business Application Mathematische & Statistische Software

Inhaltsverzeichnis

Introduction
About Questionnaires
Principles of Analysis
The Mental Health in Prison (MHP) Study
If You Are a Complete R Beginner

Description of Responses
Description using "Summary Statistics"
Summary Statistics in Subgroups
Histograms
Boxplots
Barplots
Pie Charts
Evolution of a Numerical Variable across Time (Temperature Diagram)

Description of Relationships between Variables
Relative Risks and Odds-Ratios
Correlation Coefficients
Correlation Matrices
Cartesian Plots
Hierarchical Clustering
Principal Component Analysis
A Spherical Representation of a Correlation Matrix
Focused Principal Component Analysis

Confidence Intervals and Statistical Tests of Hypothesis
Confidence Interval of a Proportion
Confidence Interval of a Mean
Confidence Interval of a Relative Risk or an Odds-Ratio
Statistical Tests of Hypothesis: Comparison of Two Percentages
Statistical Tests of Hypothesis: Comparison of Two Means
Statistical Tests of Hypothesis: The Correlation Coefficient
Statistical Tests of Hypothesis: More than Two Groups
Sample Size Requirements: The Survey Perspective
Sample Size Requirement: The Inferential Perspective

Introduction to Linear, Logistic, Poisson, and Other Regression Models
Linear Regression Models for Quantitative Outcomes
Logistic Regression for Binary Outcome
Logistic Regression for a Categorical Outcome with More than Two Levels
Logistic Regression for an Ordered Outcome
Regression Models for an Outcome Resulting from a Count

About Statistical Modelling
Coding Numerical Predictors
Coding Categorical Predictors
Choosing Predictors
Interaction Terms
Assessing the Relative Importance of Predictors
Dealing with Missing Data
The Bootstrap
Random Effects and Multilevel Modelling

Principles for the Validation of a Composite Score
Item Analysis (1): Distribution
Item Analysis (2): The Multi trait Multi-method Approach to Confirm a Subscale Structure
Assessing the Unidimensionality of a Set of Items
Factor Analysis to Explore the Structure of a Set of Items
Measurement Error (1): Internal Consistency and the Cronbach Alpha
Measurement Error (2): Inter-rater Reliability

8 Introduction to Structural Equation Modelling
Linear Regression as a Particular Instance of Structural
Equation Modelling
Factor Analysis as a Particular Instance of Structural
Equation Modelling
Structural Equation Modelling in Practice

Introduction to Data Manipulation using R
Importing and Exporting Datasets
Manipulation of Datasets
Manipulation of Variables
Checking Inconsistencies

Appendix A: The Analysis of Questionnaire Data using R: Memory Card
Data Manipulations
Importation Exportation of Datasets
Manipulation of Datasets
Manipulation of Variables
Descriptive Statistics
Univariate
Bivariate
Multidimensional
Statistical Inference
Statistical Modelling
Validation of a Composite Score
References
Index

Über Autor(innen)

After studying mathematics and getting his Ph.D. in biostatistics, the author graduated as a child and adolescent psychiatrist. He is now professor in biostatistics in Paris-Sud University, head of a master in public health and of the research lab "public health and mental health".