Jan-paul Van Wingerden

12-20-1998, 06:19 PM

Dear BIOMCH readers,

While programming some evaluation sofware I came up with a problem

concerning the use of a cumulative probabilities table.

This is the problem:

To determine the percentile of a normal distribution you have to use a

specific table, the cumulative probabilities table. When plotting this

table as a graph you get a specific curve. The problem is that I cannot

find the formula for this curve (Using such formula makes programming a

lot easier).

I found the cumulative probability function for a continuous uniform

random variable:

y=(x-a)/(b-a) where a

While programming some evaluation sofware I came up with a problem

concerning the use of a cumulative probabilities table.

This is the problem:

To determine the percentile of a normal distribution you have to use a

specific table, the cumulative probabilities table. When plotting this

table as a graph you get a specific curve. The problem is that I cannot

find the formula for this curve (Using such formula makes programming a

lot easier).

I found the cumulative probability function for a continuous uniform

random variable:

y=(x-a)/(b-a) where a