I just started playing with the data of assignment 2 and I got stuck with how to deal with the 'EVTYPE's.
Taking a look at the provided 'codebook' we should expect EVTYPE to be one of about 50 variables - but we get about 900 different values.
Is it a reasonable approach to merge various types like 'snow', 'flood', 'wind', etc. and to simply drop the rest for our study?