Beetle Mortality

Keywords: binomial regression, logistic regression, probit regression

Description

Insects were exposed to gaseous carbon disulphide for a period of 5 hours. Eight experiments were run with different concentrations of carbon disulphide.


	Variable		Description

	Dose		Dose of carbon disulphide
	Exposed		Number of beetles exposed
	Mortality		Number of beetles killed

Download

Data File (tab-delimited text file)

Source

Bliss (1935). The calculation of the dosage-mortality curve. Annals of Applied Biology.

Jørgensen, B. (1992). Example 1.2.

Analysis

Binomial regression with one continuous covariate.

Clear increasing trend. On the logistic scale, the regression has a significant quadratic component, although the linear regression satisfies a nominal goodness of fit test.