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Last month, we released nanotime, a package to work with nanosecond timestamps. See the initial release announcement for some background material and a few first examples. nanotime relies on the RcppCCTZ package for high(er) resolution time parsing and formatting: R itself stops a little short of a microsecond. And ... [Read more...]

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A number of reasons can be attributed to when a predictive model crumples such as: Inadequate data pre-processing Inadequate model validation Unjustified extrapolation Over-fitting (Kuhn, 2013) Before we div... [Read more...]

So I saw this blog post, in which Pretty Famous ranked every one of Brad Pitt’s movies (I have no idea how I came across it, I’m not particularly a movie buff or a fan of Señor Pitt, but anyway). Then I wondered how easy/hard it ... [Read more...]

Making reproducible examples can be hard. There’s a lot of things you need to consider. Like, making sure your environment is clean, the right packages are loaded, the code is formatted nicely, and images are the right resolution and dimension. Get... [Read more...]

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With thanks to NOAA's incredible data gathering and forecasting activities, I've been obsessed with this chart for the past few days: We used to live near the Napa river where this river gage is located, and still have many friends in the area. We were in the area last weekend, ... [Read more...]

Here’s a little visualization app I made a couple of months back which explores hockey players in the NHL during the 2015 – 2016 season.  As we get closer to the end of the regular season this year I’ll take  a look at 2017’s players. See the app here. See the ... [Read more...]

In this exercise we assume that we obtained the measurements of the height and the distance of the movement of a projectile by means of an experiment.We define the vectors "Height" and "Distance" that have our physical measurements.We fit a second-order model "lmr".We defined a scale of ... [Read more...]

Plotly is a d3 based graphing library used to produce interactive and high quality graphs in R. In the following exercises, we will look at the basic plots’ syntax and some basic features in the plotly functions. We will use datasets available in base R packages. Refer to the documentation ... [Read more...]

Did you know that you can completely replace the “knitting” engine in R Markdown documents? Well, you can! Why would you want to do this? Well, in the case of this post, to commit the unpardonable sin of creating a clunky jupyter notebook from a pristine Rmd file. I’m ... [Read more...]

As a beginning data scientist, you’ll have quite a few subject areas that you need to learn (and eventually master). While you’ll certainly need to learn some math and statistics, math and stats are not the first things I recommend to most beginners. Almost always, I recommend that ... [Read more...]

This week an update for xml2 and a new xslt package have appeared on CRAN. A full announcement for xml2 version 1.1 will appear on the rstudio blog. This post explains xml validation (via xsd schema) and xml transformation (via xslt stylesheets) which have been added in this release. XML schemas ... [Read more...]

TL;DR Konrad Więcko and Krzysztof Słomczyński (with tiny help from my side) have created a system that is tracing what skills are currently in demand among job offers for data scientists in Poland. What skills, how frequent and how the demand is changing over time. The ... [Read more...]

An Example of Using nimble‘s Particle Filtering Algorithms This example shows how to construct and conduct inference on a state space model using particle filtering algorithms. nimble currently has versions of the bootstrap filter, the auxiliary particle filter, the ensemble Kalman filter, and the Liu and West filter implemented. ... [Read more...]

Yesterday, I received an email from Robert Hillman.Robert wrote:"I’ve thoroughly enjoyed your recent posts and associated links on distributed lags. I’d like to throw in a slightly different perspective. To give you some brief background on myself: I did a PhD in econometrics 1993-1998 at Southampton ... [Read more...]

StackOverflow, the popular Q&A site for programmers, provides useful information to nearly 5 million programmers worldwide with its database of questions and answers — not to mention the additional comments that other programmers provide. (You might be interested in the architecture, based SQL Server 2016, required to deliver the 8.5 billion pages Stack ... [Read more...]

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