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> On Thu, 19 May 2005 05:14:44 -0500, Mario Morales > <malfonso at telecom.com.co> wrote: > > My circle have two problems. > > > > First. I don't want the horizontal line and I don't know how avoid > > it. > > > > Second. It...
I am interested in utilizing this so called "double hurdle" model in my study. We can write the model in the following way: if (z'a + u > 0 & x'b + e > 0) y = x'b + e, else y = 0 In...
Hi! Just use your factors for indexing c(15,16,17) and c("red","green","blue"). So, with the iris data: >with(iris, plot(Sepal.Length, Sepal.Width, pch=c(15,16,17)[as.integer(Species)], col=c("red","green...
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