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 executed. +-------------------+ | Key | |-------------------| | frequency | | row percentage | | column percentage | +-------------------+ The Stata command is: tabulate ca2 ca4, column row The Key box in the Review window specifies which statistics appears on each row in the cells. relation to | sex head | m f | Total ---------------+----------------------+---------- head | 321 21 | 342 | 93.86 6.14 | 100.00 | 41.42 2.88 | 22.74 ---------------+----------------------+---------- wife/husband | 2 306 | 308 | 0.65 99.35 | 100.00 | 0.26 41.98 | 20.48 ---------------+----------------------+---------- son/daughter | 374 336 | 710 | 52.68 47.32 | 100.00 | 48.26 46.09 | 47.21 ---------------+----------------------+---------- mother/father | 1 5 | 6 | 16.67 83.33 | 100.00 | 0.13 0.69 | 0.40 ---------------+----------------------+---------- other relative | 77 61 | 138 | 55.80 44.20 | 100.00 | 9.94 8.37 | 9.18 ---------------+----------------------+---------- Total | 775 729 | 1,504 | 51.53 48.47 | 100.00 | 100.00 100.00 | 100.00 How many cases are included? Only 1,504 cases are included in this table. What about cases with missing values? 1. Return to the dialog box and place a ✓mark in the box next to “Treat missing values like other values”. 2. Click on the copy button, switch to the Do-File Editor and paste the command. Write a comment 38
Stata 11 Sample Session Section 1 - Basic functions: Files, Descriptives, Data Transformations and then switch back to the dialog box to click on the Ok button. The command will be executed. Summary statistics on a continuous variable for each value in a categorical variable The by ... sort: summarize command tabulate ca2 ca4, column miss row Now we see the missing data included. We wanted counts, row percentages, and column percentages. Row percentages sum to 100 across all the cells in a row, while column percentages sum to 100 down the cells in a column. The table produced by this command tells you that there are 21 female heads of household, and that 6.12% of the total heads of households are female (row percent). Of those who are female, 2.87% are head of household (column percent). For this analysis the same command is used as for general summary statistics with a slight modification. This command will show how the mean and other statistics for a continuous variable differ by the values of one or more categorical variables. Suppose we want to know how the age of the member varied by his/her relationship to the head of household. If we did this with Tabulate we would get a table with dozens of cells for the different ages represented. The table would not be usable. Instead we will use Summarize with the “by” key word. 1. From the Statistics menu select Summaries, Tables & Tests Summary Statistics Summary Statistics The Summarize - Summary Statistics dialog box opens. 2. Select ca3 from the drop-down box for Variables 3. Under “Options” in this tab, select Standard Display . 4. Click on the “by/if/in” tab. 5. Click in the box “Repeat command for groups defined by” 6. In the box below this option, select ca2 7. Click on the copy button, switch to the do-file editor and paste. Switch back to click the Ok button. The command will be executed. This command calculates the means of the variable ca3 (age) separately for each different value of the variable ca2 (relation to head) including the system missing value. 39
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STATA 11 for Windows SAMPLE SESSION - Food Security Group ...

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