case0901 {Sleuth2}

Effects of Light on Meadowfoam Flowering

Description

Meadowfoam is a small plant found growing in moist meadows of the US Pacific Northwest. Researchers reported the results from one study in a series designed to find out how to elevate meadowfoam production to a profitable crop. In a controlled growth chamber, they focused on the effects of two light–related factors: light intensity and the timeing of the onset of the ligth treatment.

Usage

case0901

Format

A data frame with 24 observations on the following 3 variables.

Flowers

average number of flowers per meadowfoam plant

Time

time light intensity regiments started

Intens

light intensity (in \mumol/m^2/sec)

Source

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

Examples

str(case0901)
plot(Flowers~Intens, case0901, pch= ifelse(Time=="Early", 19, 21))