Normal Distribution Functions v1.01
October 19, 2006
By Bob Wang
e-mail: bobwang@comcast.net

Normal v1.01 is a TI-83,84 style command-line distribution function package. Running normcdf(-infinity,36,35,2) returns 0.691462461274, full 12 decimal accuracy. The built-in TI cumulative normal is only accurate to 8 decimals.This is a 5k option for those who want normal and inverse normal distribution functions without having to load the whole 317k Stat LE Flash App.

normack(p,m,s)
normcdf(l,u,m,s)
norminv(p,m,s)
normpdf(x,m,s)
erf(x)

All the functions are included in the "Normal v1.01 xx.tig" group file for each machine type.

To run these programs, hit the yellow 2nd key, then VAR-LINK, then scroll to the program you want. Viewing “Contents” via 2nd, F6, displays the required parameters for each function.


Distribution Descriptions, Parameters and Dependencies:

normack(p,m,s)
norminv(Area p, mean m, std dev s)
Inverse Normal Cumulative Distribution Function
Needs: none
(Only included for academic interest, use norminv(p,m,s) instead)


normcdf(l,u,m,s)
normcdf(Lower Value,Upper Value,mean m, std dev s)
Normal Cumulative Distribution Function
Needs: erf

norminv(p,m,s)
norminv(Area p, mean m, std dev s)
Inverse Normal Cumulative Distribution Function
Needs: none

normpdf(x,m,s)
normpdf(X Value, mean m, std dev s)
Normal Probability Distribution Function
Needs: none


Please alert me to any errors or problems.

This information is subject to change without notice and is provided "as is" with no warranty. Bob Wang shall not be liable for any direct, indirect, special, incidental or consequential damages in connection with the use of this material.
 
Last modified: October 19, 2006