File Handling and File Transformations in Java Draw barcode code39 in Java File Handling and File Transformations

211 File Handling and File Transformations generate, create uss code 39 none with java projects USS Code 128 Select Cases: If This dialog box allow s you to select subsets of cases using conditional expressions. A conditional expression returns a value of true, false, or missing for each case..

Figure 9-11 Select Cases If dialog box If the result of a co nditional expression is true, the case is included in the selected subset. If the result of a conditional expression is false or missing, the case is not included in the selected subset. Most conditional expressions use one or more of the six relational operators (<, >, <=, >=, =, and ~=) on the calculator pad.

Conditional expressions can include variable names, constants, arithmetic operators, numeric (and other) functions, logical variables, and relational operators.. Select Cases: Random Sample This dialog box allow s you to select a random sample based on an approximate percentage or an exact number of cases. Sampling is performed without replacement; so the same case cannot be selected more than once..

212 9 Figure 9-12 Select Cases Random Sample dialog box Approximately. Generates a random sample of approximately the specified percentage of cases. Since this javabean bar code 39 routine makes an independent pseudo-random decision for each case, the percentage of cases selected can only approximate the specified percentage. The more cases there are in the data file, the closer the percentage of cases selected is to the specified percentage.

. Exactly. A user-speci fied number of cases. You must also specify the number of cases from which to generate the sample.

This second number should be less than or equal to the total number of cases in the data file. If the number exceeds the total number of cases in the data file, the sample will contain proportionally fewer cases than the requested number..

Select Cases: Range This dialog box selec ts cases based on a range of case numbers or a range of dates or times. Case ranges are based on row number as displayed in the Data Editor. Date and time ranges are available only for time series data with defined date variables (Data menu, Define Dates).

. 213 File Handling and Java Code 39 Extended File Transformations Figure 9-13 Select Cases Range dialog box for range of cases (no defined date variables). Figure 9-14 Select Cases Range dialog box for time series data with defined date variables Weight Cases Weight Cases gives ca ses different weights (by simulated replication) for statistical analysis. The values of the weighting variable should indicate the number of observations represented by single cases in your data file. Cases with zero, negative, or missing values for the weighting variable are excluded from analysis.

Fractional values are valid; they are used exactly where this is meaningful and most likely where cases are tabulated.. 214 9 Figure 9-15 Weight Cases dialog box Once you apply a weig ht variable, it remains in effect until you select another weight variable or turn off weighting. If you save a weighted data file, weighting information is saved with the data file. You can turn off weighting at any time, even after the file has been saved in weighted form.

. Weights in Crosstabs. barcode code39 for Java The Crosstabs procedure has several options for handling case weights. For more information, see Crosstabs Cell Display in 17 on p.

345. Weights in scatterplots and histograms. Scatterplots and histograms have an option for turning case weights on and off, but this does not affect cases with a zero, negative, or missing value for the weight variable.

These cases remain excluded from the chart even if you turn weighting off from within the chart.. To Weight Cases E From the menus choo jvm Code 39 se: Data Weight Cases...

E Select Weight cases by. E Select a frequency variable..

The values of the fre quency variable are used as case weights. For example, a case with a value of 3 for the frequency variable will represent three cases in the weighted data file..

215 File Handling and File Transformations Restructuring Data Use the Restructure D spring framework Code 39 Extended ata Wizard to restructure your data for the SPSS procedure that you want to use. The wizard replaces the current file with a new, restructured file. The wizard can: Restructure selected variables into cases.

Restructure selected cases into variables. Transpose all data..

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