STATA 11 for Windows SAMPLE SESSION - Food Security Group ...

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Stata 11 Sample Session Section 0 – File structure and Basic Operations for Stata 11 The recode function ....................................................................................................................................................... 46 SECTION 2 - Restructuring Data Files - Table Lookup & Aggregation............................................................................... 52 Restructuring Data Files ......................................................................................................................................................... 52 Step 1: Generate a household level file containing the number of calories produced per household. ........ 56 Rename any key variables in both files to the same name ........................................................................................ 57 The joinby command .......................................................................................................................................................... 58 Compute total kilograms produced.................................................................................................................................... 60 The generate command ..................................................................................................................................................... 60 The drop command.............................................................................................................................................................. 61 Calculate the total calories produced............................................................................................................................... 62 Select only staple food products ........................................................................................................................................ 63 The keep if command ......................................................................................................................................................... 63 Create a new file which is a household level file rather than a household-product level file ........................ 64 The collapse command....................................................................................................................................................... 64 Step 2: Generate a household level file containing the number of adult equivalents per household. ......... 66 Create a variable with the adult equivalent for each person.................................................................................... 67 The generate.... if command ........................................................................................................................................... 67 The replace.... if command .............................................................................................................................................. 67 Replace “missing values” with a mean value................................................................................................................. 69 Calculate the adult equivalents for the household....................................................................................................... 70 The collapse command....................................................................................................................................................... 70 Step 3: Merge the two files created in steps 1 & 2 to compute calories produced per adult equivalent... 72 The merge command .......................................................................................................................................................... 72 Calculate the total calories produced per adult equivalent per household for the year .................................. 74 Computing quartiles............................................................................................................................................................... 75 The xtile command using if ............................................................................................................................................... 75 The for z in num 1/3 looping command......................................................................................................................... 76 The foreach looping command ......................................................................................................................................... 76 The levelsof command........................................................................................................................................................ 76 Examples of the foreach looping command........................................................................................................................ 79 SECTION 3 – Tables and Other Types of Analysis.................................................................................................................. 88 Tables......................................................................................................................................................................................... 88 The table command............................................................................................................................................................. 90 Comparison of the commands summarize, tabulate and table .................................................................................... 90 Print a table from the Viewer ............................................................................................................................................. 93 Multiple Response Questions............................................................................................................................................... 94 1) Multiple dichotomy (yes/no questions) .................................................................................................................. 94 The count command ........................................................................................................................................................... 95 The recode command ......................................................................................................................................................... 95 The egen command ............................................................................................................................................................. 95 The tabstat command......................................................................................................................................................... 96 2) Multiple response ............................................................................................................................................................. 96 Other Types of Analyses ....................................................................................................................................................... 98 Weights .................................................................................................................................................................................. 98 Indicator variables.................................................................................................................................................................. 99 Converting continuous variables to indicator variables ........................................................................................ 100 Converting categorical variables to indicator variables ........................................................................................ 101 SECTION 4 - Table and Graphs - how to bring them into a word processor, and ............................................................ 102 How to move Stata results into other applications..................................................................................................... 102 Tables................................................................................................................................................................................... 102 Copying tables from the Results window.................................................................................................................. 103 Using Excel to create columns from the table ......................................................................................................... 104 Graphs...................................................................................................................................................................................... 104 Scatter plot using “by” subcommand ......................................................................................................................... 107 Overlaid graphs ................................................................................................................................................................. 107 Survey Estimation - Accounting for Design Effects ..................................................................................................... 108 ANNEX I – Stata Commands ................................................................................................................................................ 113 ANNEX II - Questionnaire..................................................................................................................................................... 117 4
Stata 11 Sample Session Section 0 – File Structure and Basic Operations for Stata 11 Stata 11 - SAMPLE SESSION SECTION 0 - File structure and Basic Operations for Stata 11 This section introduces the basic concepts of levels, the notion of cross-sectional analysis, and consequently, the methods of data organization. This section gives a brief description of the file structure of Stata , version 10. It is essential that you read through this section before starting the cross sectional session. Overview When you open Stata 11 for the first time, you will see four different windows within the program— • the Results window (results of a command are displayed in this window), • the Review window(commands submitted to the processor appear in this window), the Variables window (the list of variable names in the data set that has been opened) and the Command window (where commands can be typed, this is the “active” window at startup). Other windows are available, but are not opened at startup. These windows are: • Viewer (used to view help files and log files, SMCL - markup and control language- files, and print log and other files. This window is not contained in the STATA 11 program window but stands alone and appears on the task bar as another icon.)
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