## SAS, SPSS, Stata Users: Learn R from Home April 21

March 11, 2014
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Has learning R been driving you a bit crazy? If so, it may be that you’re “lost in translation.” On April 21 and 23, I’ll be teaching a webinar, R for SAS, SPSS and Stata Users. With each R concept, … Continue reading →

## What if I were to stop publishing in journals?

March 11, 2014
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In our recent discussion of modes of publication, Joseph Wilson wrote, “The single best reform science can make right now is to decouple publication from career advancement, thereby reducing the number of publications by an order of magnitude and then move to an entirely disjointed, informal, online free-for-all communication system for research results.” My first […]The post What if I…

## googleVis code development moved to GitHub

March 11, 2014
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After nearly 4 years of developing googleVis on Google Code with SVN we decided to move to GitHub. The main reason was that Google stopped the facility of hosting pre-CRAN builds of the package for user testing. The devtools package on the other hand m...

## Machine Learning Lesson of the Day – Introduction to Linear Basis Function Models

$Machine Learning Lesson of the Day – Introduction to Linear Basis Function Models$

Given a supervised learning problem of using inputs () to predict a continuous target , the simplest model to use would be linear regression.  However, what if we know that the relationship between the inputs and the target is non-linear, but we are unsure of exactly what form this relationship has? One way to overcome […]

## Capturing Intraday data

March 11, 2014
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I want to follow up the Intraday data post with an example of how you can capture Intraday data without too much effort by recording 1 minute snapshots of the market. I will take market snapshots from Yahoo Finance using following function that downloads delayed market quotes with date and time stamps: Next we can […]

## where did the normalising constants go?! [part 1]

March 10, 2014
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When listening this week to several talks in Banff handling large datasets or complex likelihoods by parallelisation, splitting the posterior as and handling each term of this product on a separate processor or thread as proportional to a probability density, then producing simulations from the mi‘s and attempting at deriving simulations from the original product, […]

## VB News – Statwing picks up funding from data science luminary Hammerbacher

March 10, 2014
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From: http://venturebeat.com/2014/01/30/statwing-picks-up-funding-from-data-science-luminary-hammerbacher/Above: A correlation as shown in Statwing's software.Image Credit: StatwingJanuary 30, 2014 3:01 PM Jordan NovetBig data projects are tr...

## Stan Model of the Week: PK Calculation of IV and Oral Dosing

March 10, 2014
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[Update: Revised given comments from Wingfeet, Andrew and germo. Thanks! I'd mistakenly translated the dlnorm priors in the first version --- amazing what a difference the priors make. I also escaped the less-than and greater-than signs in the constraints in the model so they're visible. I also updated to match the thin=2 output of JAGS.] […]The post Stan Model of…

## Preregistration: what’s in it for you?

March 10, 2014
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Chris Chambers pointed me to a blog by someone called Neuroskeptic who suggested that I preregister my political science studies: So when Andrew Gelman (let’s say) is going to start using a new approach, he goes on Twitter, or on his blog, and posts a bare-bones summary of what he’s going to do. Then he […]The post Preregistration: what’s in…

## On deck this week: Things people sent me

March 10, 2014
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Mon: Preregistration: what’s in it for you? Tues: What if I were to stop publishing in journals? Wed: Empirical implications of Empirical Implications of Theoretical Models Thurs: An Economist’s Guide to Visualizing Data Fri: The maxim...

## Spatial perception: on the chart and in real life

March 10, 2014
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A twitter follower @mdjoner felt that something is amiss with the squares in this chart comparing real estate prices in major cities around the world. I'm not sure where the chart originally came from but there is a CNBC icon....

## Man at work(-ish)

March 10, 2014
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Perhaps one could argue that the obvious, manly activity to do at the weekend when you're home alone is to put and organise stuff in the garage. Well, I was home alone last weekend and my very own version of this was to arxiv the first p...

## How to get started with SAS: Free videos for beginners

March 10, 2014
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On most Mondays I blog about a function, programming technique, or resource that is useful for programmers who are getting started with SAS software. Recently I learned that my colleagues in the SAS education division have been hard at work developing a series of short videos that explain basic tasks [...]

## Using old versions of R packages

March 10, 2014
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I received this email yesterday: I have been using your ‘forecast’ package for more than a year now. I was on R version 2.15 until last week, but I am having issues with lubridate package, hence decided to update R version to R 3.0.1. In our organization even getting an open source application require us to go through a whole…

March 10, 2014
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In the Intraday Backtest post I showed an example of loading and working with Forex Intraday data from the FXHISTORICALDATA.COM. Recently, I came across another interesting source of Intraday data at the Bonnot Gang site. Please note that you will have to register to get access to the Intraday data; the registration is free. Today, […]

## Hipmunk worked

March 9, 2014
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In the past I’ve categorized Hipmunk as a really cool flight-finder that doesn’t actually work, as worse than Expedia, and as graphics without content. So, I thought it would be only fair to tell you that I bought a flight the other day using Hipmunk and it gave me the same flight as Expedia but […]The post Hipmunk worked appeared…

## Testing for Multivariate Normality

March 9, 2014
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In a recent post I commented on the connection between the multivariate normal distribution and marginal distributions that are normal. Specifically, the latter do not necessarily imply the former.So, let's think about this in terms of testing for norm...

## Loss‐Efficient Factor Selection

March 9, 2014
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Alexi Onatski has an interesting recent paper, "Asymptotic Analysis of the Squared Estimation Error in Misspecified Factor Models." There's also an Appendix.Four interesting cases have emerged in the literature, corresponding to two types o...

## Reviewing the peer review process?

March 9, 2014
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I received the following email: Dear Colleague, Recently we informed you about SciRev, our new website where researchers can share their experiences with the peer review process and select an efficient journal for submitting their work. Since our start, we already received over 500 reviews and many positive reactions, which reveal a great need for […]The post Reviewing the peer…

## Money(proper foot)ball?

March 9, 2014
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This is an interesting (although a bit overused, of late) topic. In some quarters, we statisticians are all akin to "moneyballs" (by the way: I should say I haven't read the book or watched the movie \$-\$ but that's by design, as I suspect I wouldn't re...

## PK calculation of IV and oral dosing in JAGS

March 9, 2014
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I am examining IV and oral dosing of problem of Chapter 6, Question 6 or Roland and Tozer Rowland and Tozer (Clinical pharmacokinetics and pharmacodynamics, 4th edition) with Jags. In this problem one subject gets an IV and an oral dose.DataThe data lo...

## Andrew Gelman, the Early Years

March 9, 2014
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Andrew Gelman reminisced recently some early research (see here, here, and here). One of those earlier links mentioned a conference Gelman went early in his career which included Jaynes. I have the proceedings to that conference and was able to grab th...

## Can a classifier that never says “yes” be useful?

March 8, 2014
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Many data science projects and presentations are needlessly derailed by not having set shared business relevant quantitative expectations early on (for some advice see Setting expectations in data science projects). One of the most common issues is the common layman expectation of “perfect prediction” from classification projects. It is important to set expectations correctly so […] Related posts: Setting expectations…