fastR (version 0.10.3)

soap: Dwindling soap

Description

A bar of soap was weighed after showering to see how much soap was used each shower.

Format

A data frame with 15 observations on the following 3 variables.

• Date

• Day days since start of soap usage and data collection

• Weight weight of bar of soap (in grams)

Details

According to Rex Boggs:

I had a hypothesis that the daily weight of my bar of soap [in grams] in my shower wasn't a linear function, the reason being that the tiny little bar of soap at the end of its life seemed to hang around for just about ever. I wanted to throw it out, but I felt I shouldn't do so until it became unusable. And that seemed to take weeks.

Also I had recently bought some digital kitchen scales and felt I needed to use them to justify the cost. I hypothesized that the daily weight of a bar of soap might be dependent upon surface area, and hence would be a quadratic function … .

The data ends at day 22. On day 23 the soap broke into two pieces and one piece went down the plughole.

Examples

# NOT RUN {
data(soap)
xyplot(Weight~Day, data=soap)

# }