A water supply company wants to control the performance of the water counters installed throughout a city. For this purpose, 60 rational samples have been taken, each one composed by 3 measurements, from the same age (10 years) and caliber water counters corresponding to two different brands, and during a period of 5 years. This dataset is based on a study case of A Coruña’s water supply company, Empresa Municipal de Aguas de La Coruña (Emalcsa).
Format
A data frame with 180 observations on the following 3 variables:
- error
The measurement error of the counters (Error: (Real Volume - Measured Volume)/Real Volume)
- sample
Sample ID
- brand
Brands of providers of counters
Examples
data(counters)
attach(counters)
summary(counters)
#> error sample brand
#> Min. :-0.001156 Min. : 1.00 A:90
#> 1st Qu.: 0.001908 1st Qu.:15.75 B:90
#> Median : 0.009774 Median :30.50
#> Mean : 0.027942 Mean :30.50
#> 3rd Qu.: 0.035789 3rd Qu.:45.25
#> Max. : 0.150982 Max. :60.00
plot(error, type="b")
detach(counters)