Authors
Pat 170
What the hell is a variance matrix? Latest
25.08.2010
When I first came to finance, I kept hearing about “risk models”. I wondered, “What the hell is a risk model?” Of course, I didn’t say this out loud — that would have given the game away. My wife has strict instructions that she...
5969 sym 6 img
Stephen Turner 165
Use meaningful color schemes in your figures Latest
03.06.2009
Some of the best figure design ideas come from cartographers. If you’ve ever read a Tufte book you’ve seen lots of examples. Let’s talk about using color effectively. Penn State geography professor Cindy Brewer’s ColorBrewer...
817 sym
Monitoramento TP:Faixa Exclusiva Av. Goethe: Faixa Exclusiva de Ônibus Latest
28.01.2020
Monitoramento da Av. Goethe durante a implantação de faixa exclusiva da ônibus Dados Waze e sua representação: Os traçados representam filas de lentidão baseadas na localização e velocidade dos usuários do Waze. O Waze gera...
3117 sym R (3685 sym/7 pcs) 20 img
Business Science 158
Python Integration in RStudio – Data Science IDE Review Latest
05.02.2019
The two major data science languages, Python and R, have historically taken two separate paths when it comes to where data scientists are doing the coding. The R language has the RStudio IDE, which is a great IDE for data science because of its...
6920 sym R (6147 sym/25 pcs) 14 img 1 tbl
Tony Hirst 156
24.05.2011
Last week I attended the OU Statistics conference on Visualisation and Presentation in Statistics (VIPS) (notes: here and here) One of the things that struck me from conversations and some of the presentations was that statistics – and in...
6349 sym 16 img
Rob J Hyndman 154
Debugging in R Latest
30.08.2007
Anyone who starts writing serious R code (i.e., code that involves user-written functions) soon finds the need to use debugging tools. There are a few basic tools in R that are worth knowing about. The function debug() allows one to step through...
1620 sym
Dice Roll Experiment Latest
18.02.2023
Simulation Study of Dice Rolls Sums Experiment Lets consider this Dice Roll Summation experiment. We will perform the experiment 100000 times, and see what sort of distribution of summations we get. We will save the results in a vector called sums....
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Keith Goldfeld 150
Everyone knows that loops in R are to be avoided but vectorization is not always possible Latest
04.05.2017
It goes without saying that there are always many ways to solve a problem in R, but clearly some ways are better (for example, faster) than others. Recently, I found myself in a situation where I could not find a way to avoid using a...
6362 sym R (7942 sym/11 pcs)
Joel Cadwell 149
Network Visualization of Key Driver Analysis Latest
08.07.2012
Whatever happened to those evaluations that your airline asked you to complete after taking a flight? They ask you for a number of ratings about buying your ticket, attributes of the plane, the service you received, and if you were satisfied, if...
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