I believe there is great potential for the use of this technology both in the development and dissemination of logical and statistical methodology within medicine. The browsers are readily available, generally at no cost and the hardware to run the IE 4.0 can be obtained for a few hundred pounds. Soon every hospital and GP practice will have a browser on the desk. These packages are simple to write and fully visible to anyone who wishes to check the logic. The statistical packages are ideal for customising to a particular need. Other much more sophisticated statistical packages are availabe which read data directly from a database. The statistical packages here are not intended to compete with these but they do allow accurate statistical analysis where it might not otherwise be available. It is possible by placing the data within the code to analyse a database directly. (See www.hutchon.freeserve.Growthbase.htm )

Single trial

Diagnostic test

Confidence intervals for relative risk

Confidence intervals for odds ratio

Estimate for odds ratio and confidence intervals under the null hypothesis

PETO odds - provides O-E and variation of O-E needed for metanalysis

Carry out metanalysis of up to 14 studies

Calculator for comparing two estimated relative risk

Calculator for generating paprameters to carry out metanalysis of RR

Calculator for combining two trials of relative risk

Conversion from risk to odds and vice versa

Confidence intervals for proportions using Wilsons method

Kaplan-Meier survival probability

Difference between mean in a normal population distribution

Difference between two means in a normal population distribution

Number needed to treat for one additional patient to be harmed (See BMJ 2000;320:503)

EPR-Val Test Pack 2 (See BMJ 2001;322:1401 - 1405 )

Generation of factorials, numbers of permutations and combinations

Generate and compare various size/age formulae.

Confidence intervals for surgical success

A caclutor which shows the application of liklihood ratios and Bayes theorem

Bayes thereom calculator with black and white balls

Another excellent site with web-browser statistical calculators Vasser statistics education

This calculator is for educational use. It is believed accurate but no responsibility for accuracy of the results is accepted by the author. David J R Hutchon BSc, MB, ChB, FRCOG Consultant Gynaecologist, Memorial Hospital, Darlington, England.

You are welcome to keep this page and use the calculator off-line. I would appreciate an E-mail if you find it useful enough to do so. E-mail to me at DJRHutchon@Postmaster.co.uk

1/10/1999