1764 search results for "Regression"

Robert Hijmans on Spatial Data Analysis

May 23, 2013
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Last week at the Davis R Users’ Group Robert Hijmans gave a talk about spatial data analysis in R. Robert is a professor of biogeography at UC Davis and the author of the raster (analysis of gridded data), dismo (species distribution modeling), and geosphere (spherical trigonometry), packages. Robert’s presentation spanned topics including basic...

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Investment Portfolio Analysis with R Language

May 22, 2013
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R has a wide application in finance analysis areas such as time series analysis, portfolio management, and risk management, with its basic functions and many professional packages in Finance. In this article, we will demonstrate how to

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Big Data Analytics in R – the tORCH has been lit!

May 22, 2013
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Model fitting exam problem

May 20, 2013
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Recently I have run an exam where the following question had risen many problems for students (here I give its shortened formulation). You are given the data generating process y = 10x + e, where e is error term. Fit linear regression using lm, ne...

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Which Torontonians Want a Casino? Survey Analysis Part 2

May 17, 2013
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Which Torontonians Want a Casino?  Survey Analysis Part 2

In my last post I said that I would try to investigate the question of who actually does want a casino, and whether place of residence is a factor in where they want the casino to be built.  So, here … Continue reading →

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Preferential attachment applied to frequency of accessing a variable

May 17, 2013
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Preferential attachment applied to frequency of accessing a variable

If, when writing code for a function, up to the current point in the code distinct local variables have been accessed for reading times (), will the next read access be from a previously unread local variable and if not what is the likelihood of choosing each of the distinct variables (global variables are ignored

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Exponential Cache Behavior

May 15, 2013
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Exponential Cache Behavior

Guerrilla alumnus Gary Little observed certain fixed-point behavior in simulations where disk IO blocks are updated randomly in a fixed size cache. For his python simulation with 10 million entries (corresponding to an allocation of about 400 MB of memory) the following results were obtained: Hit ratio (i.e., occupied) = 0.3676748 Miss ratio...

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In case you missed it: April 2013 Roundup

May 13, 2013
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In case you missed them, here are some articles from April of particular interest to R users: A critique of a SAS whitepaper comparing the performance of SAS, R and Mahout. A video presentation from statistician Tess Nesbitt at UpStream, who uses GAM survival models in R for marketing attribution analysis. The April edition of the Revolution Analytics newsletter....

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Using C libraries in R with rdyncall

May 12, 2013
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Using C libraries in R with rdyncall

One reason I like using R for data analysis is that R has a great collection of packages that let you easily apply state-of-the-art methods to your problems. But once in a while you find a library that you would like to use that does not have a R wrapper, yet. While the great Rcpp

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Reproducibility and randomness

May 11, 2013
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Reproducibility and randomness

With Stéphane Tufféry, we were working this week on a chapter of a book, entitled Statistical Learning in Actuarial Science. The chapter should be based on R functions, and we wanted to reproduce some outputs he previously obtained with SAS. The good thing is that even complex functions (logistic regression, regression trees, etc) produce the same kind of outputs....

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