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

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Stata 11 Sample Session Section 1 - Basic functions: Files, Descriptives, Data Transformations 2. The cursor should be in the variables box. There is a dropdown arrow at the end of the variables box. Click on the drop down arrow to select the variables you want. Highlight ca3 and click to select it. To close the drop down box, click in another area of the dialog box. In the options section below the variable box, note that “Standard Display” is the default selection for output. Don’t forget to click on the icon to copy the command to the clipboard, switch to the do-file editor, paste the command and switch back to the dialog box. 3. Click on the Submit button to run the command. The dialog box will remain open. The output appears in the Stata Results window. You will see that the mean for age (ca3) is 21.33602 years. The Stata command is summarize ca3 The Results window displays: Variable | Obs Mean Std. Dev. Min Max -------------+-------------------------------------------------------- ca3 | 1524 21.33602 17.69252 .5 81 Return to the dialog box. (On the task bar you can see “summarize-Summary…”, click on this task.) Click on the in the lower left corner to see more detail about the summarize command. In this help window, you can see that the first two letters of the command are underlined, e.g. summarize. In Stata, only the letters that are underlined are absolutely required for the command to be recognized. The following command also works. su ca3 Scroll down through the Viewer to see the options available with this command and examples. To close the Viewer, click on the x in the upper right hand corner of the dialog box. If we wanted to see more summary statistics on this variable we can ask for detail. Switch back to the 28
Stata 11 Sample Session Section 1 - Basic functions: Files, Descriptives, Data Transformations Summarize - Summary Statistics dialog box (you can see the icon on the task bar.) 4. Click on the radio button next to “Display additional statistics”. Click on the command to the clipboard. to copy the 5. Click on the Ok button to run the command. The dialog box will close. The results are: age ------------------------------------------------------------- Percentiles Smallest 1% 1 .5 5% 1 .6 10% 3 1 Obs 1524 25% 7 1 Sum of Wgt. 1524 50% 16 Mean 21.33602 Largest Std. Dev. 17.69252 75% 32 75 90% 48 76 Variance 313.0252 95% 57 78 Skewness .9152221 99% 69 81 Kurtosis 3.00135 Information returned by Stata commands The median age is 16 (50% - Percentile). The Stata command is summarize ca3, detail Switch to the Do-File Editor and paste the command. Insert comments to explain the commands you have pasted. When you run a command, Stata sends the information to the Results window as well as saves the information in memory. To see what has been saved, you can use the return list command, In the Command window, type return list The information that is returned from the summarize command is displayed. 29
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