Proper interpretation of pollutionRose

[tspeidel-ey]

First of all, thank you for this wonderful package and the significant effort it must have taken.

I have a question about the proper interpretation of the normalise = TRUE and statistic = "prop.mean" argument of pollutionRose. Because it's not always clear to me what's being compared to what, what is the denominator and numerator.

Suppose: pollutionRose(mydata, pollutant = "so2", normalise = TRUE, seg = 1)

Is it correct to say: among all 12 wind sectors, approximately 20% of the highest concentrations (i.e. 10-63) came from the East. However, winds from the East are not very frequent.

Now, how would one interpret this in a similar fashion? pollutionRose(mydata, pollutant = "so2", normalise = TRUE, statistic = "prop.mean", seg = 1)