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

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Stata 11 Sample Session Section 4 – Tables and Graphs, Survey estimation strata. Strata are considered to be statistically independent and can be analyzed as such. A weight has already been calculated for each household. The variable which contains this value is called hhwgt. We need to compute the cluster variable. We can use dist for the strata variable since it already contains the province value as part of the district code. Close the browser and use the gen command to create the variable “cluster1”. To be able to use the survey commands, we must first define the stratified random sampling method that was used to account for weighting, clustering and stratification. We will use the svyset command to specify the method. 1. Click on Statistics then Survey data analysis 2. Then click on Setup & utilities then Declare survey design for dataset 3. In the Primary sampling unit: box select cluster1 4. In the Strata: box select dist 5. Click on the Weights tab 6. Click on the radio button next to Sampling Weight Variable. 7. Click on the drop-down arrow for the Sampling weight variable: box and select hhwgt 8. Click on the copy button, switch to the do-file editor, paste the command, switch back to the dialog box and click on Ok . The Stata command is: svyset cluster1 [pweight=hhwgt], strata(dist) vce(linearized) singleunit(missing) After running the command we see a summary of the command in the Results window: pweight: hhwgt VCE: linearized Single unit: missing Strata 1: dist SU 1: cluster1 FPC 1: We can use the syvdesc command to look at the strata and PSU arrangement of the dataset. 1. Click on Statistics then Survey data analysis 2. Then click on Setup & utilities then Describe survey data 110
Stata 11 Sample Session Section 4 – Tables and Graphs, Survey estimation 3. We can specific a variable or just run the command to look at the complete dataset. If we were interested to know which strata have only one sampling unit, we could put a tick next the box labeled “Display only the strata with a single sampling unit” 4. Click on the copy button, switch to the do-file editor, paste the command, switch back to the dialog box and click on Ok . Once the survey design has been specified and the file saved, it is not longer necessary to specify it again. The specification is saved with the data file. We can use the svytotal command to look at the total estimates. . svy linearized : total maizea ricea milleta sunfa (running total on estimation sample) Survey: Total estimation 1. Click on Statistics / Survey data analysis 2. Then click on Means, proportions, ratios, totals then Totals 3. In the Variables box select maisea ricea milleta sunfa 4. Click on the copy button, switch to the do-file editor, paste the command, switch back to the dialog box and click on Submit Number of strata = 69 Number of obs = 6601 Number of PSUs = 394 Population size = 807414 Design df = 325 -------------------------------------------------------------- | Linearized | Total Std. Err. [95% Conf. Interval] -------------+------------------------------------------------ maizea | 649230.9 25105.89 599840.3 698621.5 ricea | 14472.95 2360.009 9830.125 19115.77 milleta | 61770.91 7346.125 47318.95 76222.87 sunfa | 24319.15 3418.858 17593.26 31045.04 -------------------------------------------------------------- 111
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STATA 11 for Windows SAMPLE SESSION - Food Security Group ...

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