Articles by Aviad Klein

Cost Weighted Logistic Loss

December 15, 2016 | Aviad Klein

The problem of weighting the type 1,2 errors on binary classification came up in a forum I visit. My solution: Here we can see the different loss behaviours We will try to classify the Virginica species from the iris dataset   And now the loss functions:
[Read more...]

R and Vertica

June 14, 2014 | Aviad Klein

I’ve been spending the last few months working my way through the integration of R and Vertica, and will try to keep here things that I find handy. I’m quite sad to see there is not much about this Vertica feature on the web, that’s a little ... [Read more...]

An example of linear discriminant analysis

January 8, 2011 | Aviad Klein

The following example was shown in an advanced statistics seminar held in tel aviv. The material for the presentation comes from C.M Bishop’s book : Pattern Recognition and Machine Learning by Springer(2006). One way of separating 2 categories using linear sub spaces of the input space (e.g. planes for 3... [Read more...]

Color choosing in R made easy

May 21, 2010 | Aviad Klein

I don’t know about you, but when I want to make a graph in R, I handpick the colors, line widths etc… to produce awesome output. A lot of my time is spent on color choosing, I had to find a more convenient way of doing so. Earl F. ... [Read more...]

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