d.blast | R Documentation |
Blasting causes tremor in buildings, which can lead to damages. This dataset shows the relation between tremor and distance and charge of blasting.
data("d.blast")
A data frame with 388 observations on the following 7 variables.
no
Identification of the date and time
date
Date in Date format. (The day and month are correct, the year is a wild guess.)
datetime
Date and time in the format '%d.%m. %H:%M'
device
Number of measuring device, 1 to 4
charge
Charge of blast
distance
Distance between blasting and location of measurement
tremor
Tremor energy (target variable)
location
Code for location of the building,
loc1
to loc8
The charge of the blasting should be controled in order to
avoid tremors that exceed a threshold.
This dataset can be used to establish the suitable rule:
For a given distance
, how large can charge
be in order
to avoid exceedance of the threshold?
Basler and Hoffmann AG, Zurich
data(d.blast)
showd(d.blast)
plyx(tremor~distance, psize=charge, data=d.blast)
rr <- lm(logst(tremor)~location+log10(distance)+log10(charge), data=d.blast)
plregr(rr)
t.date <- as.POSIXlt(paste("1999",d.blast$datetime,sep="."),
format='%Y.%d.%m. %H:%M')
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