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Created July 1982
The Catholic University of America
By Peter J. Plourd II and Ardoth A. Hassler
RIDIT analysis is a non-parametric statistical test used to compare
a sample group with an already identified distribution. RIDIT analysis
differs from other non-parametric statistical tests, such as Chi-Square,
in that it assumes an underlying natural order to the data. RIDIT
stands for "relative to the identified distribution".
RIDIT reads an input file and performs a RIDIT analysis of the
data. The output goes to a disk file named "RIDIT.LST". The program
assumes that the data has been aggregated into an N by 2 (N not greater
than 25) contingency table.
The RIDIT program will assume that the input file is set up in the
1. The first line should contain an integer number specifying
the number of cases that are to be read. There is a maximum
of 25 categories.
2. The second line must contain the format that will be used
to read in the data fields. The input is considered real and
a real format must be specified. The program will accept a
general format, such as G or F.
3. The third line must contain the information on whether the
data is in columns or rows. If the data is listed row wise
the word "ROW" should be on the third line. If the data is
listed column wise then the abbreviation "COL" should be used.
4a. For column wise data -- from the fourth line through the
n'th line (maximum of 25 categories) should be the input
records corresponding to the previous format. The first
column represents the cell total for the identified
distribution. The second column represents the cell total for
the sample distribution.
4b. For row wise data -- the fourth line should be the input
records representing the cell total for the identified
distribution. The fifth line represents the cell total for
the sample distribution.
3.0 DATA FILE
The following is an example of a correctly set up row wise data
The following is an example of a correctly set up column wise data
Note: The parentheses must be included around the format statement.
To use the RIDIT program give the following monitor commands.
RIDIT will respond with:
to which the user should type in the data file followed by a carriage
A complete example:
END OF EXECUTION
CPU TIME: 0.10 ELAPSED TIME: 5.28
For further information concerning RIDIT analysis please consult
the following references.
Joseph L. Fleiss, "Statistical Methods for Rates
and Proportions," John Wiley and Sons, New York, 1973
Bross, I. D. J. (1958). "How to Use Ridit Analysis,"
Biometrics, 14, 18-38