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Much of what you read in this book has been shaped by his keen advice and astute suggestions.

I want to start by thanking the good, kind people at StataCorp and Stata Press for their help, encouragement, and support in writing this book.

2.4 Reading comma-separated and tab-separated filesĢ.7 Reading fixed-column files with multiple lines of raw data per observationĢ.10 Entering data directly into the Stata Data EditorĢ.11 Saving comma-separated and tab-separated filesģ.4 Checking categorical by categorical variablesģ.5 Checking categorical by continuous variablesģ.6 Checking continuous by continuous variablesĤ.6 Labeling variables and values in different languagesĤ.7 Adding comments to your dataset using notesĤ.9 Changing the order of variables in a datasetĥ.12 More examples using the egen commandĥ.13 Converting string variables to numeric variablesĥ.14 Converting numeric variables to string variablesĦ.8 Merging: Additional options when merging datasetsħ Processing observations across subgroupsħ.2 Obtaining separate results for subgroupsħ.3 Computing values separately by subgroupsħ.4 Computing values within subgroups: Subscripting observationsħ.5 Computing values within subgroups: Computations across observationsħ.6 Computing values within subgroups: Running sumsħ.7 Computing values within subgroups: More examplesĨ.3 Introduction to reshaping long to wideĨ.5 Introduction to reshaping wide to longĩ.2 Tips on long-term goals in data managementĩ.3 Executing do-files and making log filesĩ.8 Repeating commands by looping over variablesĩ.9 Repeating commands by looping over numbersĩ.10 Repeating commands by looping over anythingĩ.11 Accessing results saved from Stata commandsĩ.12 Saving results of estimation commands as dataġ0.2 Finding and installing additional programsĪ.3 Working across groups of observations with byĪ.B Subsetting observations with if and inĪ.9 Subsetting observations and variables with keep and dropĪcknowledgements As I think about the process of creating this book, my heart fills with gratitude for all the help that I received in writing it.