# Category : Science and Education

Archive : EPI_PAK.ZIP

Filename : MOWAN.DOC

MOWAN (dBase Version)

Fisher's exact Confidence Intervals

Version 1.01, March 1, 1989

(c) 1989

by

Norman Staehling and Kevin M. Sullivan

Division of Nutrition

Centers for Disease Control

1600 Clifton Road

Atlanta, GA 30333

and

David A. Foster

Department of Epidemiology

University of Michigan

109 Observatory

Ann Arbor, MI 48109

INTRODUCTION

This software calculates the Fisher's exact procedure

and the limiting matrices for a 2x2 table.

USE

This program is a modification of a mainframe FORTRAN IV

routine written by Johannes Ipsen and adopted to run on an IBM PC

compatible computer. The program computes the limiting matrices

using the Fisher's exact procedure for a 2x2 table. From the

limiting matrices the odds ratio, relative risk, risk difference,

and attributable risk and their confidence limits can be

calculated. However, the calculation of the parameters other

than the odds ratio are not exact calculation but are estimates.

Odds ratio confidence limits calculated from the Fisher's

procedure from this program are the same as the "mid-P" values

described by Rothman in his text "Modern Epidemiology".

HARDWARE

Requires an IBM PC/XT/AT compatible computer with PC/MS DOS

version 2.0 or higher and with at least 512K of random access

memory (RAM). A math coprocessor is not required, although one

will be used if present.

SOFTWARE

The compiled dBase III Plus code was compiled with Clipper.

HOW TO USE MOWAN

For the Epi_Pak version, at the main menu select option 1.

The following shows the screens and an example of the dBase

version.

---------------------------------------------------------------

| **MOWAN** |

| |

| EXPOSURE |

| O YES NO |

| U --------------- |

| T YES | 21| 29| 50 |

| C |-------|-------| |

| O NO | 38| 125| 163 |

| M ---------------|------- |

| E 59 154| 213 |

| Enter two-sided confidence level (e.g., 95, 99) 95 |

| LIMITING MATRICES |

| LOWER UPPER |

| 15.3055 34.6945 26.7206 23.2794 |

| 43.6945 119.3055 32.2794 130.7206 |

| |

| Fisher's Exact |

| 95% Confidence Intervals |

| PARAMETERS PT. EST. Lower Upper |

| ----------------------------------------------------- |

| |ODDS RATIO | 2.3820 1.2045 4.6483 | |

| |RISK RATIO | 1.8901 1.1515 2.9960 | |

| |RISK DIFF | 0.1676 0.0341 0.3017 | |

| ----------------------------------------------------- |

---------------------------------------------------------------

DISTRIBUTION CONDITIONS

NON-WARRANTY. MOWAN is provided "as is" and without any

warranty expressed or implied. The user assumes all risks of

the use of MOWAN. MOWAN may not run on your particular

hardware/software configuration. We bear no responsibility

for any mishap or economic loss resulting therefrom the use

of this software.

COPYRIGHT CONDITIONS. You may make and distribute

copies of MOWAN provided that there is no material gain

involved.

USE AT YOUR OWN RISK. All risk of loss of any kind due to

the use of MOWAN is with you, the user. You are

responsible for all mishaps, even if the program proves to be

defective. This program makes certain assumptions about the

data. These assumptions affect the validity of

conclusions made based on the output from this program.

Please acknowledge MOWAN in any manuscript that uses its

calculations.

REFERENCE

Ipsen J. The ubiquitous 2x2 table, its parameters and their

confidence limits. Scand J Soc Med 12;121-7, 1984.

4

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