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Using R to Produce Scalable Vector Graphics for the Web
Statistical software is normally used during the analysis stage of a project and a cleaned up static graphic is created for the presentation. If the presentation is in web format then there are some...
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Some Common Approaches for Analyzing Likert Scales and Other Categorical Data
Analyzing Likert scale responses really comes down to what you want to accomplish (e.g. Are you trying to provide a formal report with probabilities or are you trying to simply understand the data...
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Imputing Missing Data With Expectation – Maximization
It can be fairly common to find missing values in a dataset. Having only a few missing values isn’t generally a problem and those records can be deleted listwise. In other words the entire record is...
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JSM 2013 – Monday
I am currently attending the 2013 Joint Statistical Meeting in Montreal. I will try to share a few of the things that I take away each day. Last night (Monday) I attended the JSM keynote speaker with...
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JSM 2013 – Tuesday
The Joint Statistical Meeting in Montreal has proven to be very good. Here are a few highlight from Tuesday’s sessions. There is one major problem that exists and that is there are too many good...
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I was able to attend a continuing education short course workshops at the JSM conference that proved to be quite insightful. The discussion was on data mining and was titled “Applied Data Mining...
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Data Scientists and Statisticians: Can’t We All Just Get Along
It seems that the title “data science” has taken the world by storm. It’s a title that conjures up almost mystical abilities of a person garnering information from oceans of data with ease. It’s...
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When Discussing Confidence Level With Others…
This post spawned from a discussion I had the other day. Confidence intervals are notoriously a difficult topic for those unfamiliar with statistics. I can’t really think of another statistical topic...
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Passing-Bablok Regression: R code for SAS users
While at the Joint Statistical Meeting a few weeks ago I was talking to a friend about various aspects to clinical trials. He indicated that no current R package was able to perfectly reproduce...
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The Beta Prior, Likelihood, and Posterior
The Beta distribution (and more generally the Dirichlet) are probably my favorite distributions. However, sometimes only limited information is available when trying set up the distribution. For...
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Probability of Avoiding a Run-off in the NYC 2013 Democratic Primary Election
The New York City mayoral Democratic primary election is taking place this coming Tuesday (Sep. 10th) and there are several candidates in the running. Bill de Blasio is the front runner and is expected...
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The Eve of the NYC Democratic Mayoral Primary Election
It is the eve of the New York City Democratic mayoral primary election. This is a simple follow-up on my post from last Friday as I was curious how the final pre-Election Day polling was going to...
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A Monty Simulation
I was listening to Science Friday from Sep 6th. and one of the discussions by Ira Flatow was on the well known Monty Hall Problem. This problem has been hashed out many times and in fact I was first...
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Profile Likelihood for New Jersey U.S. Senate Special Election
As it stands right now Cory Booker has a very good chance of winning the New Jersey Special U.S. Senate election on October 16 to replace Frank Lautenberg and fill the remainder of his term for the...
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Waiting in One Line or Multiple Lines
Whenever I go to the grocery store it always seems to be a lesson in statistics. I go get the things I need to buy and then I try to select the checkout register that will decrease the amount of time...
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The Uncertainty of Predictions
There are many kinds of intervals in statistics. To name a few of the common intervals: confidence intervals, prediction intervals, credible intervals, and tolerance intervals. Each are useful and...
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That’s Smooth
I had someone ask me the other day how to take a scatterplot and draw something other than a straight line through the graph using Excel. Yes, it can be done in Excel and it’s really quite simple, but...
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Rick Wicklin on the SAS blog made a post today on how to tell if a sequence of coin flips were random. I figured it was only fair to port the SAS IML code over to R. Just like Rick Wicklin did in his...
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Beta Distribution and the NJ U.S. Senate Election
The beta distribution is highly flexible distribution and applies to many situations and environments. The beta distribution applies well when there are percentages. The upcoming New Jersey U.S. Senate...
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Tracking the 2013 Hurricane Season
With it nearing the end of hurricane season it’s only appropriate to do a brief summary of the activity this year. It’s been a surprisingly low-key season as far as hurricanes are concerned. There...
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