bliss: Bliss data on deaths of flour beetles

In SMPracticals: Practicals for Use with Davison (2003) Statistical Models

Description

These are the number of adult flour beetles which died following a 5-hour exposure to gaseous carbon disulphide.

Usage

data(bliss)

Format

A data frame with 8 observations on the following 3 variables.

dose

concentration of carbon disulphide(mg. per litre)

m

Numbers of beetles exposed

r

Numbers of beetles dying

Source

Bliss, C. I. (1935).The calculation of the dosage-mortality curve. Annals of Applied BIology, 22, 134-167.

Examples

data(bliss)
attach(bliss)
plot(log(dose),r/m,ylim=c(0,1),ylab="Proportion dead")
fit <- glm(cbind(r,m-r)~log(dose),binomial)
summary(fit)

Example output

Loading required package: ellipse

Attaching package: 'ellipse'

The following object is masked from 'package:graphics':

    pairs


Call:
glm(formula = cbind(r, m - r) ~ log(dose), family = binomial)

Deviance Residuals: 
    Min       1Q   Median       3Q      Max  
-1.5934  -0.3942   0.8325   1.2585   1.5940  

Coefficients:
            Estimate Std. Error z value Pr(>|z|)    
(Intercept)  -60.722      5.181  -11.72   <2e-16 ***
log(dose)     14.885      1.265   11.77   <2e-16 ***
---
Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1

(Dispersion parameter for binomial family taken to be 1)

    Null deviance: 284.202  on 7  degrees of freedom
Residual deviance:  11.221  on 6  degrees of freedom
AIC: 41.419

Number of Fisher Scoring iterations: 4

SMPracticals documentation built on May 2, 2019, 11:12 a.m.