2765 search results for "gis"

multiplicitiesoffreedom demonstrates Chaos Theory in Excel. If…

June 29, 2012
By
multiplicitiesoffreedom demonstrates Chaos Theory in Excel. If…

multiplicitiesoffreedom demonstrates Chaos Theory in Excel. If he filled in more initial values, you would see a thick bar—like a picture of white-noise. Butterflies flapping their wings in Vermont to change the wind in Hangzhou? A drop of water on ...

Read more »

impacTwit : How big is your work on twitter?

June 29, 2012
By
impacTwit : How big is your work on twitter?

There’s a great Tom Waits song from the album “Mule Variations” called “Big in Japan”. The beauty of saying you’re big in Japan is that no one can ever really verify the statement (or at least that was more true in 1999). You might assert “my work is big on twitter”, and hey, how would I know?...

Read more »

Big Data Generalized Linear Models with Revolution R Enterprise

June 28, 2012
By
Big Data Generalized Linear Models with Revolution R Enterprise

R''s glm function for generalized linear modeling is very powerful and flexible: it supports all of the standard model types (binomial/logistic, Gamma, Poisson, etc.) and in fact you can fit any distribution in the exponential family (with the family argument). But if you want to use it on a data set with millions or rows, and especially with more...

Read more »

Effect of sample size on the accuracy of Cohen’s d estimates (95 % CI)

June 27, 2012
By
Effect of sample size on the accuracy of Cohen’s d estimates (95 % CI)

When talking about confidence intervals, Jacob Cohen famously said: “I suspect that the main reason they are not reported is that they are so embarrassingly large!” (Cohen, 1994). In this post I'll take a look at the relationship between the 95 % CI for Cohen's d and it's corresponding sample size.

Read more »

Crazy RUT in Academic Context Why Trend is Not Your Friend

June 26, 2012
By
Crazy RUT in Academic Context Why Trend is Not Your Friend

In response to Where are the Fat Tails?, reader vonjd very helpfully referred me to this paper The Trend is Not Your Friend! Why Empirical Timing Success is Determined by the Underlying’s Price Characteristics and Market Efficiency is Irrelevant by P...

Read more »

useR 2012: main conference braindump

June 24, 2012
By
useR 2012: main conference braindump

I knew R was versatile, but DANG, people do a lot with it: > > … I don’t think anyone actually believes that R is designed to make *everyone* happy. For me, R does about 99% of the things I … Continue reading →

Read more »

Experimental Design: Problem Set

June 21, 2012
By
Experimental Design: Problem Set

QUESTIONSThe tensile strength of Portland cement is being studied. Four different mixing techniques can be used economically. The following data have been collected: MixingTechniques Tensile Strength (lb/in­­2) ...

Read more »

R Workshop: Introducing Slidify – HTML5 slides from R markdown

June 20, 2012
By
R Workshop: Introducing Slidify – HTML5 slides from R markdown

Thursday, June 28th, 2012  19h. <–  new evening time! Tomson House: 650 McTavish, H3A 1Y2, Montréal, QC <– new social setting! guRu: Ramnath Vaidyanathan (McGill University) Ramnath Vaidyanathan will introduce the group to slidify, his brand new R package. From the slidify website: “The objective of slidify is to make it easy to create reproducible

Read more »

Notes from A Recent Spatial R Class I Gave

June 19, 2012
By

Below is a link to a pdf (compiled with the amazing knitr package) and some accompanying data for a recent short course I gave on basic spatial data import/analysis/visualization in R. The class was only two hours and some of the participants were bein...

Read more »

Notes from A Recent Spatial R Class I Gave

June 19, 2012
By

Below is a link to a pdf (compiled with the amazing knitr package) and some accompanying data for a recent short course I gave on basic spatial data import/analysis/visualization in R. The class was only two hours and some of the participants were bein...

Read more »