Brachycera {BSagri}

Eklektor counts of Brachycera

Description

In a field trial, 4 treatments were arranged in a randomized complete block design with 8 blocks and 32 plots. Soil eklektor traps were placed in each plot, on six dates from 2005-07-12 to 2005-09-25, the number of individuals of Brachycera (Flies, Order Diptera) hatching from soil were counted. The individuals were classified to the family level. Interest was in assessing potential effects of the novel treatment (Novum) on the abundance of Brachycera, compared to a near standard (Standard) and two additional standard treatments, A and B.

Usage

data(Brachycera)

Format

A data frame with 192 observations on the following 15 variables.

Date

a POSIXt variable, the time of counting the individuals in the eklektor trap

Treatment

a factor with 4 levels A B Standard Novum, where Novum is the novel treatment of interest in safety assessment, and Standard is the nearest standard treatment which commonly accepted. A and B are two additional standard treatments.

Block

a numeric vector, specifying the eight blocks 1-8

Plot

a factor with levels A1 A2 to Standard8, indicator of the individuals plots

Agromy

a numeric vector, counts of individuals

Anthom

a numeric vector, counts of individuals

Callip

a numeric vector, counts of individuals

Chloro

a numeric vector, counts of individuals

Ephyd

a numeric vector, counts of individuals

Droso

a numeric vector, counts of individuals

Hybo

a numeric vector, counts of individuals

Musci

a numeric vector, counts of individuals

Phori

a numeric vector, counts of individuals

Sphaer

a numeric vector, counts of individuals

Total

a numeric vector, counts of individuals

Source

...

Examples

data(Brachycera)

par(mar=c(11,5,3,1))

boxplot(Total ~ Treatment*Date, data=Brachycera, las=2, 
col=c("white","white","blue","green"))

legend(x=15, y=80, legend=levels(Brachycera$Treatment),
 fill=c("white","white","blue","green"))