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Introduction to StatsDirect & SPSS Fourth Year Projects, University of Manchester. Annie Herbert Medical Statistician Research & Development Support Unit Salford Royal Hospitals NHS Foundation Trust annie.herbert@manchester.ac.uk May 2010 (v. 1). Outline. Available packages Layout

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introduction to statsdirect spss fourth year projects university of manchester

Introduction to StatsDirect & SPSSFourth Year Projects, University of Manchester

Annie Herbert

Medical Statistician

Research & Development Support Unit

Salford Royal Hospitals NHS Foundation Trust

annie.herbert@manchester.ac.uk

May 2010 (v. 1)

outline
Outline
  • Available packages
  • Layout
  • Entering data
  • Data analysis
  • Practical tasks
entering data13
Entering Data
  • Can open Excel files in StatsDirect/SPSS but won’t retain formulae.
    • If starting from scratch, double click on grey headings to change titles.
    • If opening Excel file in StatsDirect, titles take up the first row. In SPSS, they become the grey headers.
  • Make sure one variable per column.
  • Convert dates/times.
  • Both packages only deal in numbers, text just for reference so could need coding.
missing data
Missing Data
  • StatsDirect treats a blank cell as missing data, but also recognises a ‘*’.
    • Better to use a ‘*’.
  • SPSS recognises a ‘.’.
    • Better to use codes, which can be established in ‘Variable View’.
    • E.g., for the variable systolic BP, ‘888’ when missing due to refusal to disclose, ‘999’ when missing due to death, etc.
anything below this line requires having a dataset and selecting columns from the worksheet
Anything below this line requires having a dataset and selecting columns from the worksheet.
slide20
When performing analyses using the worksheet prompts will appear at each stage specific to type of analysis:
finally
Finally:
  • StatsDirect:
    • Readily available on all library PCs and laptops at Salford Royal.
    • Trial version can be downloaded from www.statsdirect.com
    • Licence can be requested from the IT Service Desk: www.manchester.ac.uk/servicedesk.
  • SPSS:
    • Available on some (university) computers in the library at Salford Royal.
    • Can be downloaded onto personal computers via http://www.applications.itservices.manchester.ac.uk/show_content.php?id=5.
  • Extra StatsDirect/SPSS guides and example datasets available on http://www.medicine.manchester.ac.uk/intranet/statistics/statsnotes/.