[R] pmt

[Ravi Varadhan]

That is essentially zero, because you are so far out in the left tail of the distribution.  So, you can ignore the negative sign and treat it as zero.

Ravi.
____________________________________________________________________

Ravi Varadhan, Ph.D.
Assistant Professor,
Division of Geriatric Medicine and Gerontology
School of Medicine
Johns Hopkins University

Ph. (410) 502-2619
email: rvaradhan at jhmi.edu


----- Original Message -----
From: statfan <irene_vrbik at hotmail.com>
Date: Sunday, March 27, 2011 1:06 pm
Subject: [R] pmt
To: r-help at r-project.org


> I am working with the pmt function in the {mnormt} package, and i am getting
>  negative values returned.  the following is an example of one of my outputs:
>  
>  pmt(x = c(3.024960, -1.010898), mean = c(21.18844, 21.18844), S =
>  matrix(c(.319,.139,.139,0.319), 2, 2),df = 42)
>  # -6.585641e-18
>  
>  Any help on why i'm getting negative numbers would be very much appreciated.
>  
>  THanks!
>  
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