On this Picostat.com statistics page, you will find information about the NOxEmissions data set which pertains to NOx Air Pollution Data. The NOxEmissions data set is found in the robustbase R package. You can load the NOxEmissions data set in R by issuing the following command at the console data("NOxEmissions"). This will load the data into a variable called NOxEmissions. If R says the NOxEmissions data set is not found, you can try installing the package by issuing this command install.packages("robustbase") and then attempt to reload the data. If you need to download R, you can go to the R project website. You can download a CSV (comma separated values) version of the NOxEmissions R data set. The size of this file is about 458,290 bytes.
NOx Air Pollution Data
A typical medium sized environmental data set with hourly measurements
of NOx pollution content in the ambient air.
A data frame with 8088 observations on the following 4 variables.
day number, a factor with levels
730, typically with 24 hourly measurements.
\log of hourly mean of NOx concentration in
ambient air [ppb] next to a highly frequented motorway.
\log of hourly sum of NOx emission of
cars on this motorway in arbitrary units.
Square root of wind speed [m/s].
The original data set had more observations, but with missing values.
Here, all cases with missing values were omitted
na.omit(.)), and then only those were retained that
belonged to days with at least 20 (fully) observed hourly
René Locher (at ZHAW, Switzerland).
another NOx dataset,
plot(LNOx ~ LNOxEm, data = NOxEmissions, cex = 0.25, col = "gray30")## Not run: ## these take too much time --
## p = 340 ==> already Least Squares is not fast
(lmNOx <- lm(LNOx ~ . ,data = NOxEmissions))
plot(lmNOx) #-> indication of 1 outlier M.NOx <- MASS::rlm(LNOx ~ . , data = NOxEmissions)
## M-estimation works
## whereas MM-estimation fails:
try(MM.NOx <- MASS::rlm(LNOx ~ . , data = NOxEmissions, method = "MM"))
## namely because S-estimation fails:
try(lts.NOx <- ltsReg(LNOx ~ . , data = NOxEmissions))
try(lmR.NOx <- lmrob (LNOx ~ . , data = NOxEmissions))## End(Not run)
Dataset imported from https://www.r-project.org.