130 search results for "heatmap"

BISON USGS species occurrence data

May 27, 2013
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BISON USGS species occurrence data

The USGS recently released a way to search for and get species occurrence records for the USA. The service is called BISON (Biodiversity Information Serving Our Nation). The service has a web interface for human interaction in a browser, and two APIs (application programming interface) to allow machines to interact with their database. One of the...

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Omni test for statistical significance

May 9, 2013
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Omni test for statistical significance

In survey research, our datasets nearly always comprise variables with mixed measurement levels – in particular, nominal, ordinal and continuous, or in R-speak, unordered factors, ordered factors and numeric variables. Sometimes it is useful to be able to do blanket tests of one set of variables (possibly of mixed level) against another without having to

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Writing from R to Excel with xlsx

May 1, 2013
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Writing from R to Excel with xlsx

Paul Teetor, who is doing yeoman’s duty as one of the organizers of the Chicago R User Group (CRUG), asked recently if I would do a short presentation about a “favorite package”.  I picked xlsx, one of the many packages that provides a bridge between spreadsheets and R.  Here are the slides from my presentation

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Using the SVD to find the needle in the haystack

April 19, 2013
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Using the SVD to find the needle in the haystack

Sitting with a data set with too many variables? The SVD can be a valuable...

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Examples for sjPlotting functions, including correlations and proportional tables with ggplot #rstats

April 18, 2013
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Examples for sjPlotting functions, including correlations and proportional tables with ggplot #rstats

Sometimes people ask me how the examples of my plotting functions I show here can be reproduced without having a SPSS data set (or at least, without having the data set I use because it’s not public yet). So I … Weiterlesen →

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Introducing the healthvis R package – one line D3 graphics with R

April 2, 2013
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We have been a little slow on the posting for the last couple of months here at Simply Stats. That’s bad news for the blog, but good news for our research programs! Today I’m announcing the new healthvis R package … Continue reading →

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“Building ractives is so addictive it should be illegal!”

March 27, 2013
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clickme is an amazing R package. I was not sure what to expect when I first saw Nacho Caballero's announcement. I actually was both skeptical and intimidated, but neither reaction was justified. The examples prove its power, and his wiki tutorials ease...

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Analyse Quandl data with R – even from the cloud

March 10, 2013
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Analyse Quandl data with R – even from the cloud

I have read two thrilling news about the really promising time-series data provider called Quandl recently: Quandl: A Wikipedia for Time Series DataQuandl package released to CRANWith the help of the Quandl R package* (development version...

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Visualizing Risky Words — Part 2

March 9, 2013
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Visualizing Risky Words — Part 2

This is a follow-up to my Visualizing Risky Words post. You’ll need to read that for context if you’re just jumping in now. Full R code for the generated images (which are pretty large) is at the end. Aesthetics are the primary reason for using a word cloud, though one can pretty quickly recognize what

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More visualisation of 2012 NFL Quarterback performance with R

February 12, 2013
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More visualisation of 2012 NFL Quarterback performance with R

In last week’s post I used R heatmaps to visualise the performance of NFL Quarterbacks in 2012. This was done in a 2 step process, Clustering QB performance based on the 12 performance metrics using hierarchical clustering Plotting the performance clusters using R’s pheatmap library An output from the step 1 is the cluster dendrogram

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