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HP 20b statistical distributions
02-26-2015, 06:13 PM (This post was last modified: 02-26-2015 06:17 PM by Dieter.)
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HP 20b statistical distributions
I wanted to find out if the 20b could be an option for flashing it into a WP34s. It arrived today and I tried this and that with the original 20b firmware. One of the first things were the statistical distributions. Here I got some unexpected results: while the Normal CDF ("LTND") seems to work fine, the inverse is way off. For instance LTND–1(0,9) returns 1,34479283373 instead of the expected 1,28155156554. Likewise LTND–1(0,05) yields –1,68555786757 instead of –1,64485362695. Other distributions are more or less off either. For instance the Student quantile for 0,9 with 20 dof is returned as 1,32534081283 instead of 1,32534070699. Again, the CDF is fine while the quantile is off.

What's going on there? I cannot remember the 30b had the same problem.

Dieter
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HP 20b statistical distributions - Dieter - 02-26-2015 06:13 PM



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