Posts Tagged ‘ Uncategorized ’

Resources for the FPP book

September 3, 2014
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Resources for the FPP book

The FPP resources page has recently been updated with several new additions including R code for all examples in the book. This was already available within each chapter, but the examples have been collected into one file per chapter to save copying ...

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How to create a hexagonal bin plot in SAS

September 2, 2014
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How to create a hexagonal bin plot in SAS

While I was working on my recent blog post about two-dimensional binning, a colleague asked whether I would be discussing "the new hexagonal binning method that was added to the SURVEYREG procedure in SAS/STAT 13.2." I was intrigued: I was not aware that hexagonal binning had been added to a […]

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A new candidate for worst figure

September 1, 2014
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A new candidate for worst figure

Today I read a paper that had been submitted to the IJF which included the following figure along with several similar plots. (Click for a larger version.) I haven’t seen anything this bad for a long time. In fact, I think I would find it very diffi...

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Counting observations in two-dimensional bins

August 27, 2014
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Counting observations in two-dimensional bins

Last Monday I discussed how to choose the bin width and location for a histogram in SAS. The height of each histogram bar shows the number of observations in each bin. Although my recent article didn't mention it, you can also use the IML procedure to count the number of […]

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The Chi-Squared Test of Independence – An Example in Both R and SAS

The Chi-Squared Test of Independence – An Example in Both R and SAS

Introduction The chi-squared test of independence is one of the most basic and common hypothesis tests in the statistical analysis of categorical data.  Given 2 categorical random variables, and , the chi-squared test of independence determines whether or not there exists a statistical dependence between them.  Formally, it is a hypothesis test with the following null and […]

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Choosing bins for histograms in SAS

August 25, 2014
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Choosing bins for histograms in SAS

When you create a histogram with statistical software, the software uses the data (including the sample size) to automatically choose the width and location of the histogram bins. The resulting histogram is an attempt to balance statistical considerations, such as estimating the underlying density, and "human considerations," such as choosing […]

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Forecasting with R in WA

August 24, 2014
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Forecasting with R in WA

On 23–25 September, I will be running a 3-day workshop in Perth on “Forecasting: principles and practice” mostly based on my book of the same name. Workshop participants will be assumed to be familiar with basic statistical tools such as multiple...

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Analyzing activity-tracker data: How many steps per day do YOU take?

August 22, 2014
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Analyzing activity-tracker data: How many steps per day do YOU take?

My wife got one of those electronic activity trackers a few months ago and has been diligently walking every day since then. At the end of the day she sometimes reads off how many steps she walked, as measured by her activity tracker. I am always impressed at how many […]

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biblatex for statisticians

August 22, 2014
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biblatex for statisticians

I am now using biblatex for all my bibliographic work as it seems to have developed enough to be stable and reliable. The big advantage of biblatex is that it is easy to format the bibliography to conform to specific journal or publisher styles. It is also possible to have structured bibliographies (e.g., divided into sections: books, papers, R packages, etc.) Here is my default setting which should be suitable…

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A (very) brief review of published human subjects research conducted with social media companies

August 20, 2014
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As I wrote the other day, more and more human subjects research is being performed by large tech companies. The best way to handle the ethical issues raised by this research is still unclear. The first step is to get some … Continue reading →

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