case0802: Breakdown Times for Insulating Fluid under different Voltage

In Sleuth2: Data Sets from Ramsey and Schafer's "Statistical Sleuth (2nd Ed)"

Description

In an industrial laboratory, under uniform conditions, batches of electrical insulating fluid were subjected to constant voltages until the insulating property of the fluids broke down. Seven different voltage levels were studied and the measured reponses were the times until breakdown.

Usage

case0802

Format

A data frame with 76 observations on the following 3 variables.

Time

times until breakdown (in minutes)

Voltage

voltage applied (in kV)

Group

factor variable (group number)

Source

Ramsey, F.L. and Schafer, D.W. (2002). The Statistical Sleuth: A Course in Methods of Data Analysis (2nd ed), Duxbury.

Examples

str(case0802)
plot(log(Time)~Voltage, case0802)

Example output

'data.frame':	76 obs. of  3 variables:
 $ Time   : num  5.79 1579.52 2323.7 68.85 108.29 ...
 $ Voltage: num  26 26 26 28 28 28 28 28 30 30 ...
 $ Group  : Factor w/ 7 levels "Group 1","Group 2",..: 1 1 1 2 2 2 2 2 3 3 ...

Sleuth2 documentation built on May 2, 2019, 7:01 a.m.