[R] Probit Analysis

[apjaworski@mmm.com]

Jacqueline,

This should be a simple application of GLM.  Check the help pages for glm,
family and dose.p in library MASS.  Look at the example at the bottom of
the dose.p help page - it does almost exactly what you need.

Hope this helps,

Andy

__________________________________
Andy Jaworski
Engineering Systems Technology Center
3M Center, 518-1-01
St. Paul, MN 55144-1000
-----
E-mail: apjaworski at mmm.com
Tel:  (651) 733-6092
Fax:  (651) 736-3122


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  |      To:       r-help at stat.math.ethz.ch                                                                                     |
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  |      Subject:  [R] Probit Analysis                                                                                          |
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Hello all,

I have a very simple set of data and I would like to analyze them with
probit analysis.
The data are:

X    Event          Trial
100  8         8
75   8         8
50   6         8
25   4         8
10   2         8
0    0         8

I want to estimate the value of X that will give a 95% hit rate
(Event/Trial) and the corresponding
95% CI. Anyone can offer some help? Thanks!!

- Jacqueline

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