3794 search results for "GIS"

Updated list of upcoming Rcpp talks and workshops

This is an updated version of an earlier post in March. A number of talks about Rcpp are scheduled over the next couple of months: On Wednesday May 14 I will be speaking at the Chicago R Users Group meeting charmingly titled Warm Up for R...

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A Tutorial and Talk at useR! 2014 [Important Update]

May 12, 2014
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See the update below I'll be doing a morning tutorial at useR! at the end of June in Los Angeles. I've done this same presentation at the last few conferences and this will probably be the last time for this specific workshop. The tutorial outline is: Conventions in R Data splitting and estimating performance Data pre-processing Over-fitting and resampling Training and tuning tree...

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Twitter sentiment analysis based on affective lexicons with R

Twitter sentiment analysis based on affective lexicons with R

Continue to dig tweets. After we reviewed how to count positive, negative and neutral tweets in previous post, I discovered another great idea. Suppose positive or negative is not enough and we want to understand the rate of positivity or negativity. For example, “good” in tweet has 4 points rating, but “perfect” has 6. Thus, we... Read More »

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Automatically Exporting Multiple Cross Tables from Tableau Server into Excel

May 10, 2014
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Automatically Exporting Multiple Cross Tables from Tableau Server into Excel

Introduction The following blog post is based on a classical reporting task most of the people working in BI got frequently: Besides all the nice dashboards you create in Tableau, from time to time people will approach you with a request for a “data extract” – reports that...

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Comrades Marathon Negative Splits: The Plot Thickens

May 10, 2014
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Comrades Marathon Negative Splits: The Plot Thickens

I have been thinking a little more about those mysterious negative splits. Not too surprisingly, this thinking happened while I was out running along the Durban beachfront this morning. Let’s have a look at the ten most extreme negative splits from Comrades Marathon 2013: Below are the splits data for these runners (in the same

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In case you missed it: April 2014 roundup

May 9, 2014
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In case you missed them, here are some articles from April of particular interest to R users: Registration is now open for the useR! 2014 R conference in Los Angeles. A new Kaggle competition challenges R users to predict which shoppers will become repeat buyers. Data on R usage around the world, presented as an interative map. The New...

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stopping rule impact

May 8, 2014
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stopping rule impact

Here is a question from my friend Shravan Vasishth about the consequences of using a stopping rule: Psycholinguists and psychologists often adopt the following type of data-gathering procedure: The experimenter gathers n data points, then checks for significance (p<0.05 or not). If it’s not significant, he gets more data (n more data points). Since time

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Classification of the Hyper-Spectral and LiDAR Imagery using R (mostly). Part 3: Shadow Removal

May 8, 2014
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Classification of the Hyper-Spectral and LiDAR Imagery using R (mostly). Part 3: Shadow Removal

This is my third post in this series, here are the links to the Part 1 and Part 2. Sorry for the delay, but at that time I got completely consumed with my PhD thesis and this story just went out of my mind. To the point. There were 2 types of shadows I had...

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The RSelenium R Package (Free Webinar)

May 7, 2014
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The Orange County R User Group (OC-RUG) will soon host a free webinar on the new “RSelenium” R Package which provides a set of R bindings for the Selenium 2.0 webdriver using the JsonWireProtocol. Using RSelenium, you can automate web browsers locally or remotely in order to test various web apps, such as Shiny applications – for example. Webinar Format: ...

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The RSelenium R Package (Free Webinar)

May 6, 2014
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The RSelenium R Package (Free Webinar)

The Orange County R User Group (OC-RUG) will soon host a free webinar on the new “RSelenium” R Package which provides a set of R bindings for the Selenium 2.0 webdriver using the JsonWireProtocol. Using RSelenium, you can automate web … Continue reading →

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