Example SPSS Basic Medical Statistics Course October 2010 Wilma Heemsbergen.

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Presentation transcript:

Example SPSS Basic Medical Statistics Course October 2010 Wilma Heemsbergen

Windows in SPSS For each data set: (>1 possible): - Data view - Variable view Furthermore, a syntax window can be opened Open windows are shown in the tab “Windows” New windows can be opened: file – new Data, output, syntax can be saved in separate files

Import Data Sets in SPSS (*.dbf, *.xls, *txt,/…) Using the “paste” button, the corresponding syntax is pasted (ready to run).

Get data GET FILE='U:\data_statcursus\trial_rt.sav'. DATASET NAME DataSet1 WINDOW=FRONT. Menu: file – open - data It is also possible to start with opening a syntax file, which will read / open the data (without using the menu). To run: (select and) hit the run button. Use the “paste” button to get the syntax in the syntax window

Compute DATASET ACTIVATE DataSet1. COMPUTE duur_rt=tend - tstart. EXECUTE. Menu: transform - compute

Reports, describing data

Displaying data

Histogram GRAPH /HISTOGRAM=duur_rt. Menu: graphs - legacy dialogs - histogram

Descriptives Menu: analyse - descriptive statistics - descriptives DESCRIPTIVES VARIABLES=age /STATISTICS=MEAN STDDEV MIN MAX.

Recode Menu: transform - recode RECODE age (45 thru 69.99=0) (70 thru 90=1) INTO age70. EXECUTE.

Split file / selection Menu: data - split file data - select cases

COMPUTE filter_$=(arm=1). VARIABLE LABEL filter_$ 'arm=1 (FILTER)'. VALUE LABELS filter_$ 0 'Not Selected' 1 'Selected'. FORMAT filter_$ (f1.0). FILTER BY filter_$. EXECUTE. SORT CASES BY arm. SPLIT FILE SEPARATE BY arm.

There is a possibility to save a subset of the variables: “save as”, option “variables”

Try the following to practice with SPSS: (data set and syntax file are available at website) -Read the file “trial_rt”, using menu. Paste the syntax. -Compute a new variable (save the syntax). -Generate a frequency table, a pie chart, a cross tab, using: the menu / the paste button / the syntax window. -Generate a frequency table for each rand arm seperately, using the options “split file” and “select”. -Save file: trial_rt_extended as an SPSS file. -Save a subset of variables (trial_rt_subset) -Save output: output_trial_rt. -Save syntax: syntax_trial_rt_extended. -Open the database again, using your syntax -Save file as a *.txt file or an *.xls file and try to read it again by importing the data set.