First, I am using a free, open-source program named PSPP. You can read about it and download here. as far as I can tell, it is able to perform the functions necessary for the beginning review exercises in the book: SPSS Guide to Data Analysis. Click to download the data file for this book (v. 15, at least).
CH 3: COUNTING RESPONSES
- Using a frequency table - to summarize info, find errors in data
- Finding percentage and cumulative percentages
- Graphical displays with pie and bar charts, and histograms
- The mode, median, and mean of responses
- Using the gss.sav data file (General Social Survey)
Mean, Median, and Mode
Mode is the most frequently found value.
- in the data, 1 7 9 1 4 0 1 1 4 2, the mode is 1 because it appears most frequently.
Median is the middle value when the data are arranged from smallest to highest.
- for 2 9 1 8 0 3, the median is (0 1 2 3 8 9) 2.5 = even number of data halfway b/n the two middle values, for odd data, the exact one in the middle (0 1 2 3 7 8 9) = 3
Mean is the average value of the data.
- for 3 5 1 0 2 3, 3+5+1+0+2+3=14/6 (no. of data) = 2.33
Frequency Table: Counting Reponses
Using the gss.sav data, and the variable satjob (job satisfaction),