search for: changyou

...ggplot(huron, aes(year)) + geom_line(aes(y=level+5, colour="above")) + geom_line(aes(y=level-5, colour="below")) + scale_colour_manual("Direction", c("above"="black", "below"="black")) Thanks, Edwin Changyou Sun, Ph.D. Associate Professor Natural Resource Policy & Economics Box 9681, Department of Forestry Mississippi State University Mississippi State, MS 39762 #363 Thompson Hall (662) 325 7271 (ph), 325 8726 (fax) csun@cfr.msstate.edu www.cfr.msstate.edu/forestry [[alternative H...

...culating return levels. There are multiple fires on individual calendar days. Each year there are 2000 to 5000 fires. I am not sure how to specify the number of observations per year, i.e., the value of "npy" and which formulas should be used. Thank you for your help. Edwin Changyou Sun, Ph.D. Associate Professor Natural Resource Policy & Economics Box 9681, Department of Forestry Mississippi State University Mississippi State, MS 39762 #363 Thompson Hall (662) 325 7271 (ph), 325 8726 (fax) csun@cfr.msstate.edu www.cfr.msstate.edu/forestry > xa &lt...

Hello All, I am interested in estimating a duration model (also known as survival analysis or event-history analysis). I use an economic dataset. In economics terms, the model is "duration model with sample selection (or selectivity)." The time spell variable is only observed for a sample that meets certain requirements so the sample is nonrandom. Does anybody know any R package that