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. The SOFTWARE and documentation are provided with RESTRICTED RIGHTS. [. . . ] If you cannot add another stage, it is likely because: No cluster variable was specified in the Design Variables step. 31 Preparing a Complex Sample for Analysis You selected WR estimation in the Estimation Method step. This is the third stage of the analysis, and the Wizard supports a maximum of three stages. Analysis Preparation Wizard: Finish Figure 3-7 Analysis Preparation Wizard Finish step This is the final step. You can save the plan file now or paste your selections to a syntax window. When editing a plan, you can save the edited plan to a new file or overwrite the existing plan file. 32 Chapter 3 Modifying an Existing Analysis Plan E From the menus choose: Analyze Complex Samples Prepare for Analysis. . . E Select Edit a plan file, and choose a plan filename to which you will save the analysis plan. E Click Next to continue through the Wizard. E Review the analysis plan in the Plan Summary step, and then click Next. Subsequent steps are largely the same as for a new design. See the help for individual steps for more information. E Navigate to the Finish step, and specify a new name for the edited plan file or choose to overwrite the existing plan file. Optionally, you can: Remove stages from the plan. 33 Preparing a Complex Sample for Analysis Analysis Preparation Wizard: Plan Summary Figure 3-8 Analysis Preparation Wizard Plan Summary step This step allows you to review the analysis plan and remove stages from the plan. Remove Stages. You can remove stages 2 and 3 from a multistage design. Since a plan must have at least one stage, you can edit but not remove stage 1 from the design. Chapter Complex Samples Plan 4 Complex Samples analysis procedures require analysis specifications from an analysis or sample plan file in order to provide valid results. Figure 4-1 Complex Samples Plan dialog box Plan. Specify the path of an analysis or sample plan file. In order to use Unequal WOR estimation for clusters drawn using a PPS WOR method, you need to specify a separate file containing the joint probabilities. This file is created by the Sampling Wizard during sampling. 35 Chapter Complex Samples Frequencies 5 The Complex Samples Frequencies procedure produces frequency tables for selected variables and displays univariate statistics. Optionally, you can request statistics by subgroups, defined by one or more categorical variables. Example. Using the Complex Samples Frequencies procedure, you can obtain univariate tabular statistics for vitamin usage among 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. The procedure produces estimates of cell population sizes and table percentages, plus standard errors, confidence intervals, coefficients of variation, design effects, square roots of design effects, cumulative values, and unweighted counts for each estimate. Additionally, chi-square and likelihood ratio statistics are computed for the test of equal cell proportions. Complex Samples Frequencies Data Considerations Data. Variables for which frequency tables are produced should be categorical. Subpopulation variables can be string or numeric, but should be categorical. Assumptions. The cases in the data file represent a sample from a complex design that should be analyzed according to the specifications in the file selected in the Plan dialog box. 37 38 Chapter 5 Obtaining Complex Samples Frequencies E From the menus choose: Analyze Complex Samples Frequencies. . . 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. [. . . ] E Select County as a subpopulation variable. E Click Statistics. 122 Chapter 14 Figure 14-3 Statistics dialog box E Select Confidence interval, Unweighted count, and Population size in the Statistics group. E Select t-test and enter 1. 3 as the test value. E Click OK in the Complex Samples Ratios dialog box. Ratios Figure 14-4 Ratios table The default display of the table is very wide, so you will need to pivot it for a better view. 123 Complex Samples Ratios Pivoting the Ratios Table E Double-click the table to activate it. [. . . ]