search for: tb144

...lay the y-axis values where the two histograms are back to back, rather than on the y-axis? Below, I've pasted the graph that I'm trying to recreate, as well as the code and graph from my current (unsuccessful) attempt. options(digits=1) require(Hmisc) out <- histbackback(split(data8$TB144, data8$PRES), probability=TRUE, main="Back to Back Histogram", ylab="TB144 1min rates") barplot(-out$left, col="ivory2", horiz=TRUE, space=0, add=TRUE, axes=FALSE) barplot(out$right, col="ivory4", horiz=TRUE, space=0, add=TRUE, axes=FALSE) grid(nx=NULL, ny =...

Hi, I am trying to use CART to find an ideal cut-off value for a simple diagnostic test (ie when the test score is above x, diagnose the condition). When I put in the model fit=rpart(outcome ~ predictor1(TB144), method="class", data=data8) sometimes it gives me a tree with multiple nodes for the same predictor (see below for example of tree with 1 or multiple nodes). Is there a way to tell it to make only 1 node? Or is it safe to assume that the cut-off value on the primary node is the ideal...