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intro - SPSS Instructions for Introduction to Biostatistics...

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SPSS Instructions for Introduction to Biostatistics Larry Winner Department of Statistics University of Florida
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SPSS Windows Data View Used to display data Columns represent variables Rows represent individual units or groups of units that share common values of variables Variable View Used to display information on variables in dataset TYPE: Allows for various styles of displaying LABEL: Allows for longer description of variable name VALUES: Allows for longer description of variable levels MEASURE: Allows choice of measurement scale Output View Displays Results of analyses/graphs
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Data Entry Tips I For variables that are not identifiers (such as name, county, school, etc), use numeric values for levels and use the VALUES option in VARIABLE VIEW to give their levels. Some procedures require numeric labels for levels. SPSS will print the VALUES on output For large datasets, use a spreadsheet such as EXCEL which is more flexible for data entry, and import the file into SPSS Give descriptive LABEL to variable names in the VARIABLE VIEW Keep in mind that Columns are Variables, you don’t want multiple columns with the same variable
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Data Entry/Analysis Tips II When re-analyzing previously published data, it is often possible to have only a few outcomes (especially with categorical data), with many individuals sharing the same outcomes (as in contingency tables) For ease of data entry: Create one line for each combination of factor levels Create a new variable representing a COUNT of the number of individuals sharing this “outcome” When analyzing data Click on: DATA WEIGHT CASES WEIGHT CASES BY Click on the variable representing COUNT All subsequent analyses treat that outcome as if it occurred COUNT times
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Example 1.3 - Grapefruit Juice Study crcl 38 66 74 99 80 64 80 120 To import an EXCEL file, click on: FILE OPEN DATA then change FILES OF TYPE to EXCEL (.xls) To import a TEXT or DATA file, click on: FILE OPEN DATA then change FILES OF TYPE to TEXT (.txt) or DATA (.dat) You will be prompted through a series of dialog boxes to import dataset
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Descriptive Statistics-Numeric Data After Importing your dataset, and providing names to variables, click on: ANALYZE DESCRIPTIVE STATISTICS DESCRIPTIVES Choose any variables to be analyzed and place them in box on right Options include: ( 29 n S S n y y S y n y y n i i n i i n i i : Mean S.E. : Variance 1 : deviation Std. : Sum : Mean 2 1 2 1 1 - - = = = = =
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Example 1.3 - Grapefruit Juice Study Descriptive Statistics 8 38 120 621 77.63 8.63 24.401 595.411 8 CRCL Valid N (listwise) Statistic Statistic Statistic Statistic Statistic Std. Error Statistic Statistic N Minimum Maximum Sum Mean Std.
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