One of my most successful postings is the one of R resources for hydrologists. Sometimes contributions arrive from non -hydrologist. This is the case that of two posts from Wiekvoet whose authors download and analyse rainfall data from the Netherlands Royal Institute. The first post mainly performs an exploratory analysis of the data. The second one looks for rainfall changes in the past 100 years. Enjoy the reading.
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As a byproduct one learn also how to use ggplot2 through some examples.