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GAP Toolkit 5 Training in basic drug abuse data management and analysis

GAP Toolkit 5 Training in basic drug abuse data management and analysis. Training session 7 SPSS: Recode and Compute. Objectives. To introduce and demonstrate SPSS tools for recoding variables and creating new variables To introduce and demonstrate the use of SPSS command syntax

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GAP Toolkit 5 Training in basic drug abuse data management and analysis

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  1. GAP Toolkit 5Training in basic drug abuse data management and analysis Training session 7 SPSS: Recode and Compute

  2. Objectives • To introduce and demonstrate SPSS tools for recoding variables and creating new variables • To introduce and demonstrate the use of SPSS command syntax • To introduce and demonstrate Help features in SPSS from a dialogue box

  3. Types of recode • A categorical variable into a new set of categories • A continuous variable into a categorical variable

  4. Recode approaches • Into pre-defined categories of interest • Into categories of equal size

  5. Example: pre-defined categories • Recode weekly expenditure on drugs into the following categories: • Low expenditure <= £100 a week • High expenditure >= £101 a week

  6. select variable for recoding and click

  7. click here to map old  new values

  8. Weekly drug expenditure

  9. Example: quantiles • Recode weekly expenditure into the following: • 4 categories, each with approximately the same number of cases (quartiles) • 10 categories, each with approximately the same number of cases (deciles)

  10. NTILES of Expend

  11. NTILES of EXPEND

  12. Compute • Creates new variables using: • Standard mathematical operators • A full range of functions • Conditional statements

  13. Transform/Compute click here to define variable type

  14. Type and Label

  15. Yexpend=Expend*52

  16. Explore: Yexpend Descriptives

  17. Example 2: Age • Convert date of birth to age in years

  18. (DATE.DMY(01,01,2002) - dob) / (365.25*24*60*60)

  19. Explore: Age Descriptives

  20. Help • Context-sensitive Help: • Right click on any part of a dialogue box to obtain help • Dialogue box Help button

  21. Command language • Command-line rather than Windows interface • More flexible • Reusable • Saved as text files

  22. Syntax window • Enter SPSS commands: • Type directly • Paste from a dialogue box • Run SPSS commands • Save as a text file

  23. The Paste button click to copy command into Syntax Window

  24. The Run menu

  25. Syntax for Age

  26. Recode: Into same variable Into different variable Compute: Mathematical operators Functions Dialogue box Help: Context-sensitive Help Dialogue box Help button Command language: Syntax Window Dialogue box Paste button Summary

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