PHData {NPP}

PH Data on four sites in Virginia

Description

The dataset is used to assess if there is site impairment. The site impairment is defined as whether the pH values at a site indicate that the site violates a (lower) standard of 6.0 more than 10% of the time.

Usage

data("PHData")

Format

A data frame with 325 observations on the following 3 variables.

Station

the site number, labeled as 1 to 4

Data.Time

indicator of historical data (coded as 0) or current data (coded as 1)

PH

value of PH on the site

Examples

data(PHData)