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

1

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