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+--- Thread: Statistics issue with NORMALD_CDF? (/thread-3468.html)
Statistics issue with NORMALD_CDF? - Jonathan Cameron - 03-23-2015 08:19 PM
I'm trying to run normal cumulative distribution functions in "Home" mode.
First, this seems to work fine in CAS:
normald_cdf(10, 0.2, 10.4) ==> 0.9772...
But when I try this in Home mode, I get:
10 Enter 0.2 Enter 10.4 Enter NORMALD_CDF() ==> 1
which is wrong...
However, the test case in help works fine:
0 ENTER 1 ENTER 2 ENTER NORMALD_CDF() ==> 0.9772...
which gives the same as in the CAS test case above because they both correspond to 2 sigma...
So am I doing something wrong in Home mode? Or is the mean value and standard deviation being treated as 0, 1 rather than 10, 0.2?
Thanks
-Jonathan
RE: Statistics issue with NORMALD_CDF? - salvomic - 03-23-2015 08:33 PM
(03-23-2015 08:19 PM)Jonathan Cameron Wrote: I'm trying to run normal cumulative distribution functions in "Home" mode.
First, this seems to work fine in CAS:
normald_cdf(10, 0.2, 10.4) ==> 0.9772...
But when I try this in Home mode, I get:
10 Enter 0.2 Enter 10.4 Enter NORMALD_CDF() ==> 1
which is wrong...
...
hello Jonathan,
also by in Home (with RPN) it' wrong, but it's ok in Algebric mode and TextBook, so I think there is something not correct concerning RPN...
Salvo
RE: Statistics issue with NORMALD_CDF? - Terje Vallestad - 03-23-2015 08:43 PM
(03-23-2015 08:19 PM)Jonathan Cameron Wrote: But when I try this in Home mode, I get:
10 Enter 0.2 Enter 10.4 Enter NORMALD_CDF() ==> 1
So am I doing something wrong in Home mode? Or is the mean value and standard deviation being treated as 0, 1 rather than 10, 0.2?
I think you need to tell it how many arguments you take off the stack, so please try
10 Enter 0.2 Enter 10.4 Enter NORMALD_CDF(3)
Cheers, Terje
RE: Statistics issue with NORMALD_CDF? - Jonathan Cameron - 03-24-2015 12:37 AM
(03-23-2015 08:43 PM)Terje Vallestad Wrote:(03-23-2015 08:19 PM)Jonathan Cameron Wrote: But when I try this in Home mode, I get:
10 Enter 0.2 Enter 10.4 Enter NORMALD_CDF() ==> 1
So am I doing something wrong in Home mode? Or is the mean value and standard deviation being treated as 0, 1 rather than 10, 0.2?
I think you need to tell it how many arguments you take off the stack, so please try
10 Enter 0.2 Enter 10.4 Enter NORMALD_CDF(3)
Cheers, Terje
Thanks Terje!
I did not know you had to tell it how many arguments to process. It makes sense that the number of arguments is necessary since 1, 3, and 4 arguments all are legal but mean different things.
-Jonathan