Description Usage Format Details Source References Examples
Data from a small experiment on the toxicity to the tobacco budworm
1 |
A data frame with 12 observations on the following 4 variables:
sex
the sex of the budworm
dose
amount of cypermethrin exposed to
s
number of budworms affected
n
total number of budworms
The data come from an experiment on the toxicity to the tobacco budworm Heliothis virescens of doses of the pyrethoid trans-cypermethrin to which the moths were beginning to show resistance. Batches of 20 moths of each sex were exposed for three days to the pyrethroid and the number in each batch that were dead or knocked down was recorded.
Collette, D. (1991) Modelling Binary Data. Chapman and Hall, London. p 75
Venables, W.N and Ripley, B. (2002) Modern Applied Statitics with S, Springer, New York.
1 2 3 | data(budworm.df)
bugs.glm<-glm(s/n~sex+dose,family=binomial,weights=n,data=budworm.df)
summary(bugs.glm)
|
Loading required package: s20x
Loading required package: leaps
Loading required package: rgl
Loading required package: lattice
Warning messages:
1: In rgl.init(initValue, onlyNULL) : RGL: unable to open X11 display
2: 'rgl_init' failed, running with rgl.useNULL = TRUE
3: .onUnload failed in unloadNamespace() for 'rgl', details:
call: fun(...)
error: object 'rgl_quit' not found
Call:
glm(formula = s/n ~ sex + dose, family = binomial, data = budworm.df,
weights = n)
Deviance Residuals:
Min 1Q Median 3Q Max
-2.5566 -1.3326 0.3384 1.1254 1.8838
Coefficients:
Estimate Std. Error z value Pr(>|z|)
(Intercept) -1.16607 0.26155 -4.458 8.26e-06 ***
sex -0.96855 0.32954 -2.939 0.00329 **
dose 0.15996 0.02341 6.832 8.39e-12 ***
---
Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
(Dispersion parameter for binomial family taken to be 1)
Null deviance: 124.876 on 11 degrees of freedom
Residual deviance: 27.968 on 9 degrees of freedom
AIC: 64.078
Number of Fisher Scoring iterations: 5
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.