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Example SPSS
Basic Medical Statistics CourseOctober 2010Wilma Heemsbergen
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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
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Import Data Sets in SPSS
(*.dbf, *.xls, *txt,/…)
Using the “paste” button, the corresponding syntax is pasted (ready to run).
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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
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Compute
DATASET ACTIVATE DataSet1.COMPUTE duur_rt=tend - tstart.EXECUTE.
Menu: transform - compute
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Reports, describing data
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Displaying data
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Histogram
GRAPH /HISTOGRAM=duur_rt.
Menu: graphs - legacy dialogs - histogram
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DescriptivesMenu: analyse - descriptive statistics - descriptives
DESCRIPTIVES VARIABLES=age /STATISTICS=MEAN STDDEV MIN MAX.
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Recode
Menu: transform - recode
RECODE age (45 thru 69.99=0) (70 thru 90=1) INTO age70.EXECUTE.
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Split file / selection
Menu: data - split file data - select cases
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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.
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There is a possibility to savea subset of the variables:“save as”, option “variables”
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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.