دانلود کتاب Data Management Using Stata

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Acknowledgments Tables Figures Preface to the Second Edition Preface 1 Introduction 1.1 Using this book 1.2 Overview of this book 1.3 Listing observations in this book 1.4 More online resources 2 Reading and importing data files 2.1 Introduction 2.2 Reading Stata datasets 2.3 Importing Excel spreadsheets 2.4 Importing SAS files 2.4.1 Importing SAS .sas7bdat files 2.4.2 Importing SAS XPORT Version 5 files 2.4.3 Importing SAS XPORT Version 8 files 2.5 Importing SPSS files 2.6 Importing dBase files 2.7 Importing raw data files 2.7.1 Importing comma-separated and tab-separated files 2.7.2 Importing space-separated files 2.7.3 Importing fixed-column files 2.7.4 Importing fixed-column files with multiple lines of raw data per observation 2.8 Common errors when reading and importing files 2.9 Entering data directly into the Stata Data Editor 3 Saving and exporting data files 3.1 Introduction 3.2 Saving Stata datasets 3.3 Exporting Excel files 3.4 Exporting SAS XPORT Version 8 files 3.5 Exporting SAS XPORT Version 5 files 3.6 Exporting dBase files 3.7 Exporting comma-separated and tab-separated files 3.8 Exporting space-separated files 3.9 Exporting Excel files revisited: Creating reports 4 Data cleaning 4.1 Introduction 4.2 Double data entry 4.3 Checking individual variables 4.4 Checking categorical by categorical variables 4.5 Checking categorical by continuous variables 4.6 Checking continuous by continuous variables 4.7 Correcting errors in data 4.8 Identifying duplicates 4.9 Final thoughts on data cleaning 5 Labeling datasets 5.1 Introduction 5.2 Describing datasets 5.3 Labeling variables 5.4 Labeling values 5.5 Labeling utilities 5.6 Labeling variables and values in different languages 5.7 Adding comments to your dataset using notes 5.8 Formatting the display of variables 5.9 Changing the order of variables in a dataset 6 Creating variables 6.1 Introduction 6.2 Creating and changing variables 6.3 Numeric expressions and functions 6.4 String expressions and functions 6.5 Recoding 6.6 Coding missing values 6.7 Dummy variables 6.8 Date variables 6.9 Date-and-time variables 6.10 Computations across variables 6.11 Computations across observations 6.12 More examples using the egen command 6.13 Converting string variables to numeric variables 6.14 Converting numeric variables to string variables 6.15 Renaming and ordering variables 7 Combining datasets 7.1 Introduction 7.2 Appending: Appending datasets 7.3 Appending: Problems 7.4 Merging: One-to-one match merging 7.5 Merging: One-to-many match merging 7.6 Merging: Merging multiple datasets 7.7 Merging: Update merges 7.8 Merging: Additional options when merging datasets 7.9 Merging: Problems merging datasets 7.10 Joining datasets 7.11 Crossing datasets 8 Processing observations across subgroups 8.1 Introduction 8.2 Obtaining separate results for subgroups 8.3 Computing values separately by subgroups 8.4 Computing values within subgroups: Subscripting observations 8.5 Computing values within subgroups: Computations across observations 8.6 Computing values within subgroups: Running sums 8.7 Computing values within subgroups: More examples 8.8 Comparing the by and tsset commands 9 Changing the shape of your data 9.1 Introduction 9.2 Wide and long datasets 9.3 Introduction to reshaping long to wide 9.4 Reshaping long to wide: Problems 9.5 Introduction to reshaping wide to long 9.6 Reshaping wide to long: Problems 9.7 Multilevel datasets 9.8 Collapsing datasets 10 Programming for data management: Part I 10.1 Introduction 10.2 Tips on long-term goals in data management 10.3 Executing do-files and making log files 10.4 Automating data checking 10.5 Combining do-files 10.6 Introducing Stata macros 10.7 Manipulating Stata macros 10.8 Repeating commands by looping over variables 10.9 Repeating commands by looping over numbers 10.10 Repeating commands by looping over anything 10.11 Accessing results stored from Stata commands 11 Programming for data management: Part II 11.1 Writing Stata programs for data management 11.2 Program 1: hello 11.3 Where to save your Stata programs 11.4 Program 2: Multilevel counting 11.5 Program 3: Tabulations in list format 11.6 Program 4: Scoring the simple depression scale 11.7 Program 5: Standardizing variables 11.8 Program 6: Checking variable labels 11.9 Program 7: Checking value labels 11.10 Program 8: Customized describe command 11.11 Program 9: Customized summarize command 11.12 Program 10: Checking for unlabeled values 11.13 Tips on debugging Stata programs 11.14 Final thoughts: Writing Stata programs for data management A Common elements A.1 Introduction A.2 Overview of Stata syntax A.3 Working across groups of observations with by A.4 Comments A.5 Data types A.6 Logical expressions A.7 Functions A.8 Subsetting observations with if and in A.9 Subsetting observations and variables with keep and drop A.10 Missing values A.11 Referring to variable lists A.12 Frames A.12.1 Frames example 1: Can I interrupt you for a quick question? A.12.2 Frames example 2: Juggling related tasks A.12.3 Frames example 3: Checking double data entry Subject index