R: Ozone concentration damage to picea spruce

picea {MESS} | R Documentation

## Ozone concentration damage to picea spruce

### Description

Damage scores (ordinal scale) for Picea Sitchesis shoots at two dates, at four temperatures, and 4 ozone Levels

### Format

An artificial data frame with 18 observations in each of three groups.

date

  a character vector giving the date

temp

  temperature in degrees Celcius

conc

  Ozone concentration at 4 different levels

damage

  the damage score from 0-4, higher is more damage

count

  The number of occurrences of this group

### Source

P.W. Lucas, D.A. Cottam, L.J. Sheppard, B.J. Francis (1988). "Growth Responses and Delayed Winter Hardening in Sitka Spruce Following Summer Exposure to Ozone," New Phytologist, Vol. 108, pp. 495-504.

### Examples

    data(picea)

[Package MESS version 0.5.6 Index]