Re: OVC-discuss Digest, Vol 21, Issue 22

From: Kathy Dopp <kathy_dot_dopp_at_gmail_dot_com>
Date: Fri Jul 21 2006 - 12:13:14 CDT

On 7/21/06, ovc-discuss-request@listman.sonic.net
<ovc-discuss-request@listman.sonic.net> wrote:
> Date: Fri, 21 Jul 2006 07:34:58 -0700 (PDT)
> From: "Edmund R. Kennedy" <ekennedyx@yahoo.com>
>
> Hello All:
>
> Could an approximate solution be derived
> graphically via one or more nomographs?

Hi Ed.
I don't really understand what you are suggesting. However, I
received an email from Frank yesterday and:

1. Frank says that his approach to solving the EI equation may work
after all because he says it will work for cases where N>10 (i.e. the
number of vote counts to audit is over 10). However, when I looked at
his long derivation I thought I saw some errors in it, esp since his
result gave worse approximations than the "selection with replacement"
approximation equation. I'm on the road for a couple of days without
my copy of Frank's derivation, and when I get home I'll call Frank and
go over his derivation's steps in gory detail and check the results
again.

2. A computer program could quickly hone in on the right solution to
as much precision as needed by using the "selection with replacement"
over-approximation equation as a first-guess solution; checking the
result by comparing the resulting probability with the desired
probability; generating another guess on the low side; using the
average of the two best former guesses for the next guess; checking
the resulting probability with the desired one,... It would be a very
quick process. Although, an elegant one-step formula would be so much
nicer.

Frank & I will first try to solve the original equation accurately.

That said, Ed, if you want to explain what you mean to me, please call
me at 435-658-4657 or cell 917-656-0066. Thank you. It sounds
interesting.

Kathy

>
> --- Jerry Lobdill <lobdillj@charter.net> wrote:
>
> > Hi Kathy,
> >
> > I'm working on your suggested task (below).
> >
> > Your original equation is correct, and if we have to
> > live with
> > something other than a closed form solution, so be
> > it. ---

-
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Received on Mon Jul 31 23:17:06 2006

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