datana (version 1.0.6)

sludge: Sludge data are at different cities, with a value of concentration zinc.

Description

Dataset contains 36 observations

Usage

data(sludge)

Format

Contains four variables, as follows:

city

Name of city.

rate

Concentration rate of sludge.

zinc

Value of concentration ( in ppm).

trt.comb

Combination between city and rate factors.

References

not yet

Examples

data(sludge2)    
table(sludge$city,sludge$rate) 
levels(sludge$city)
tapply(sludge$zinc, list(sludge$city,sludge$rate), mean)