search for: abrigo

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2010 Jul 19
2
replacing elements of distance matrix
Hi! I am trying to implement non-bipartite matching. I have around 500 sites which can be clustered by 10 regions. I am able to calculate pairwise Mahalanobis distances between sites (thanks to another post in the forum). However, I want to constrain my match to sites within the same region. Thus I want to replace elements of the distance matrix with a high value, say 999999, for sites not of the
2009 Oct 21
1
combining multiple 3D graphs
Hi all! I am a grad stat student and is fairly new in using R. I am doing a regression tree in one of my problem sets. I have already identified the cut-points (using Stata) for the regression. My problem is how to graph the fitted values of z against the independent variables x and y. Basically, I want to graph the following: z=87.67 if 0<x<=29 & 0<y<=48 z=75 if