User manual SPSS COMPLEX SAMPLES 12.0

[. . . ] SPSS Complex Samples 12. 0 TM For more information about SPSS® software products, please visit our Web site at http://www. spss. com or contact SPSS Inc. 233 South Wacker Drive, 11th Floor Chicago, IL 60606-6412 Tel: (312) 651-3000 Fax: (312) 651-3668 SPSS is a registered trademark and the other product names are the trademarks of SPSS Inc. No material describing such software may be produced or distributed without the written permission of the owners of the trademark and license rights in the software and the copyrights in the published materials. Use, duplication, or disclosure by the Government is subject to restrictions as set forth in subdivision (c) (1) (ii) of The Rights in Technical Data and Computer Software clause at 52. 227-7013. [. . . ] E Select a plan file and optionally select a custom joint probabilities file. Figure 5-1 Frequencies dialog box E Select at least one frequency variable. Optionally, you can: Specify variables to define subpopulations. Statistics are computed separately for each subpopulation. 39 Complex Samples Frequencies Complex Samples Frequencies Statistics Figure 5-2 Complex Samples Frequencies Statistics dialog box Cells. This group allows you to request estimates of the cell population sizes and table percentages. Statistics. This group produces statistics associated with the population size or table percentage. Standard error. A confidence interval for the estimate, using the specified level. Coeffcient of variation. The ratio of the standard error of the estimate to the estimate. Unweighted count. The ratio of the variance of the estimate to the variance obtained by assuming that the sample is a simple random sample. This is a measure of the effect of specifying a complex design, where values further from 1 indicate greater effects. Square root of design effect. This is a measure of the effect of specifying a complex design, where smaller values indicate greater effects. Cumulative values. The cumulative estimate through each value of the variable. 40 Chapter 5 Test of equal cell proportions. This produces chi-square and likelihood ratio tests of the hypothesis that the categories of a variable have equal frequencies. Separate tests are performed for each variable. Complex Samples Missing Values Figure 5-3 Missing Values dialog box Tables. Missing values are determined on a table-by-table basis, thus the cases used to compute statistics may vary across frequency or crosstabulation tables. Ensure consistent case base. Missing values are determined across all variables, thus the cases used to compute statistics are consistent across tables. Categorical Design Variables. This group determines whether user-missing values are valid or invalid. 41 Complex Samples Frequencies Complex Samples Options Figure 5-4 Options dialog box Display subpopulations. You can choose to have subpopulations displayed in the same table or in separate tables. Chapter Complex Samples Descriptives 6 The Complex Samples Descriptives procedure displays univariate summary statistics for several variables. Optionally, you can request statistics by subgroups, defined by one or more categorical variables. Example. Using the Complex Samples Descriptives procedure, you can obtain univariate descriptive statistics for the activity levels of U. S. citizens, based on the results of the National Health Interview Survey (NHIS) and with an appropriate analysis plan for this public use data. Statistics. The procedure produces means and sums, plus t-tests, standard errors, confidence intervals, coefficients of variation, unweighted counts, population sizes, design effects, and square roots of design effects for each estimate. Complex Samples Descriptives Data Considerations Data. Subpopulation variables can be string or numeric, but should be categorical. Assumptions. [. . . ] The Complex Samples Frequencies procedure provides univariate descriptive statistics for categorical variables. Chapter Complex Samples Ratios 14 The Complex Samples Ratios procedure displays univariate summary statistics for ratios of variables. Optionally, you can request statistics by subgroups, defined by one or more categorical variables. Using Complex Samples Ratios to Aid Property Value Assessment A state agency is charged with ensuring that property taxes are fairly assessed from county to county. Taxes are based on the appraised value of the property, so the agency wants to track property values across counties to be sure that each county's records are equally up-to-date. Since resources for obtaining current appraisals are limited, the agency chose to employ complex sampling methodology to select properties. [. . . ]