User Guide

Chapter
39
Ratio Statis
tics
The Ratio Statistics procedure provides a comprehensive list of summary statistics
for describ
ing the ratio between two scale variables.
You can sort the output by values of a grouping variable in ascending or descending
order. The ratio statistics report can be suppressed in the output and the results
savedtoan
external file.
Example. Is there good uniformity in the ratio between the appraisal price and sale
price of homes in each of five counties? From the output, you might learn that the
distribut
ion of ratios varies considerably from county to county.
Statistics. Median, mean, weighted mean, confidence intervals, coefficient of
dispersion (COD), median-centered coefficient of variation, mean-centered coefficient
of variat
ion, price-related differential (PRD), standard deviation, average absolute
deviation (AAD), range, minimum and maximum values, and the concentration index
computed for a user-specified range or percentage within the median ratio.
Data. Use
numeric codes or short strings to code grouping variables (nominal or
ordinal level measurements).
Assumptions. The variables that define the numerator and denominator of the ratio
should b
e scale variables that take positive values.
To Obtain Ratio Sta tistics
E From the menus choose:
Analyze
Descrip
tive Statistics
Ratio..
.
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