search for: ed90

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2010 Nov 22
2
Probit Analysis: Confidence Interval for the LD50 using Fieller's and Heterogeneity (UNCLASSIFIED)
Classification: UNCLASSIFIED Caveats: NONE A similar question has been posted in the past but never answered. My question is this: for probit analysis, how do you program a 95% confidence interval for the LD50 (or LC50, ec50, etc.), including a heterogeneity factor as written about in "Probit Analysis" by Finney(1971)? The heterogeneity factor comes into play through the chi-squared
2010 Nov 24
0
4. Rexcel (Luis Felipe Parra)-how to run a code from excel
...ect: Re: [R] Probit Analysis: Confidence Interval for the LD50 using Fieller's and Heterogeneity (UNCLASSIFIED) Message-ID: <AANLkTinRodwVPCrXm8SnfAfcn3QQ6-qJg4GnaNZMG0B3 at mail.gmail.com> Content-Type: text/plain Hi: The MASS package has a function dose.p() to produce a CI for ED50, ED90 or EDp in general (0 < p < 100). It takes a model object (presumably from a suitable logistic regression) as input. You could always take the code already available and adapt it to your situation or you could investigate one or more of the packages devoted to dose-response models. A useful...