John Johnson | R-bloggers

How we voted in South Carolina

August 3, 2017 | John Johnson

Purpose This post seeks to explore how Greenville, SC and surrounding areas voted in the 2016 election. It also demonstrates how to retrieve data from the Data.World site. To retrieve data from this site using the tools in this post, you have to create an account (easy to do if ...

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How to make interactive maps with Census and local data in R

July 20, 2017 | John Johnson

So the goal here is to focus back on Greenville County and have even more granularity. I look at median house prices near Greenville and then overlay the park data downloaded earlier. This time, for the Census data, I use the tidycensus package that came out recently. Furthermore, instead of ...

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How to make maps with Census data in R

July 20, 2017 | John Johnson

US Census Data The US Census collects a number of demographic measures and publishes aggregate data through its website. There are several ways to use Census data in R, from the Census API to the USCensus2010 package. If you are interested in geopolitical data in the US, I recommend exploring ...

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Personal data collection and analysis

April 16, 2017 | John Johnson

Motivation behind this example I was diagnosed with sleep apnea last year, and have to use a continuous positive airway pressure (CPAP) machine to sleep well enough to feel alert during the day. The machine uploads data (via cellular connection) to a website that will give me results for the ...

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Inauguration speeches

January 27, 2017 | John Johnson

Acquiring inauguration speeches Though not about Greenville especially, it might be interesting to quantitatively analyze inauguration speeches. This analysis will be done using two paradigms: the tm package and the tidytext package. We will read the speeches in such a way that we use the tidytext package; later on we ...

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Greenville on Twitter

December 20, 2016 | John Johnson

In this blogpost, we use R to use Twitter data to analyze topics of interest to Greenville, SC. We will describe obtaining, manipulating, and summarizing the data. Twitter is a “microblogging” service where users can, usually publicly, share links, pictures, or short comments (up to 140 characters) onto a timeline. The ...

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What do they talk about on Greenville Reddit?

December 20, 2016 | John Johnson

Reddit is a discussion forum website with many discussion rooms (“subreddits”) on different topics. Greenville, SC has its own subreddit. It might be of interest to see what kind of discussions take place. We can do this in a systematic way using t... [Read more...]

Plotting GeoJSON polygons on a map with R

December 15, 2016 | John Johnson

In a previous post we plotted some points, retrieved from a public dataset in GeoJSON format, on top of a Google Map of the area surrounding Greenville, SC. In this post we plot some public data in GeoJSON format as well, but instead of particular points, we plot polygons. Polygons ... [Read more...]

I set up a new data analysis blog

December 11, 2016 | John Johnson

Well, I tried to write a blog post using the RStudio Rmarkdown system, and utterly failed. Thus, I set up a system where I could write from RStudio. So I set up a Github pages blog at randomjohn.github.io. There I can easily write and publish posts involving data ... [Read more...]

Plotting GeoJSON data on a map with R

December 10, 2016 | John Johnson

GeoJSON is a standard text-based data format for encoding geographical information, which relies on the JSON (Javascript object notation) standard. There are a number of public datasets for Greenville, SC that use this format, and, the R programming language makes working with these data easy. Install the rgeojson library, which ... [Read more...]

Windows 10 anniversary updates includes a whole Linux layer – this is good news for data scientists

September 24, 2016 | John Johnson

If you are on Windows 10, no doubt you have heard that Microsoft included the bash shell in its 2016 Windows 10 anniversary update. What you may not know is that this is much, much more than just the bash shell. This is a whole Linux layer that enables you to use Linux ... [Read more...]

Which countries have Regrexit?

June 26, 2016 | John Johnson

This doesn't have a lot to do with bio part of biostatistics, but is an interesting data analysis that I just started. In the wake of the Brexit vote, there is a petition for a redo. The data for the petition is here, in JSON format.Fortunately, in R, ...

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Which countries have Regrexit?

June 26, 2016 | John Johnson

This doesn't have a lot to do with bio part of biostatistics, but is an interesting data analysis that I just started. In the wake of the Brexit vote, there is a petition for a redo. The data for the petition is here, in JSON format.Fortunately, in R, ...

[Read more...]

Simulating a Weibull conditional on time-to-event is greater than a given time

May 20, 2016 | John Johnson

Recently, I had to simulate a time-to-event of subjects who have been on a study, are still ongoing at the time of a data cut, but who are still at risk of an event (e.g. progressive disease, cardiac event, death). This requires the simulation of a con...

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Simulating a Weibull conditional on time-to-event is greater than a given time

May 20, 2016 | John Johnson

Recently, I had to simulate a time-to-event of subjects who have been on a study, are still ongoing at the time of a data cut, but who are still at risk of an event (e.g. progressive disease, cardiac event, death). This requires the simulation of a conditional Weibull. To ...

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Talk to Upstate Data Science Group on Caret

January 14, 2016 | John Johnson

Last night I gave an introduction and demo of the caret R package to the Upstate Data Science group, meeting at Furman University. It was fairly well attended (around 20 people), and well received.It was great to get out of my own comfort zone a bit (since graduate school, I've ... [Read more...]

Talk to Upstate Data Science Group on Caret

January 14, 2016 | John Johnson

Last night I gave an introduction and demo of the caret R package to the Upstate Data Science group, meeting at Furman University. It was fairly well attended (around 20 people), and well received.It was great to get out of my own comfort zone a b... [Read more...]

Even the tiniest error messages can indicate an invalid statistical analysis

November 25, 2015 | John Johnson

The other day, I was reading in a data set in R, and the function indicated that there was a warning about a parsing error on one line. I went ahead with the analysis anyway, but that small parsing error kept bothering me. I thought it was just one lin... [Read more...]

Even the tiniest error messages can indicate an invalid statistical analysis

November 25, 2015 | John Johnson

The other day, I was reading in a data set in R, and the function indicated that there was a warning about a parsing error on one line. I went ahead with the analysis anyway, but that small parsing error kept bothering me. I thought it was just one lin... [Read more...]

RStudio is reminding me of the older Macs

April 15, 2013 | John Johnson

The only thing missing is the cryptic ID number.Well, the only bad thing is that I am trying to run a probabilistic graphical model on some real data, and having a crash like this will definitely slow things down. [Read more...]

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Articles by John Johnson

How we voted in South Carolina

How to make interactive maps with Census and local data in R

How to make maps with Census data in R

Personal data collection and analysis

Inauguration speeches

Greenville on Twitter

What do they talk about on Greenville Reddit?

Plotting GeoJSON polygons on a map with R

I set up a new data analysis blog

Plotting GeoJSON data on a map with R

Windows 10 anniversary updates includes a whole Linux layer – this is good news for data scientists

Which countries have Regrexit?

Which countries have Regrexit?

Simulating a Weibull conditional on time-to-event is greater than a given time

Simulating a Weibull conditional on time-to-event is greater than a given time

Talk to Upstate Data Science Group on Caret

Talk to Upstate Data Science Group on Caret

Even the tiniest error messages can indicate an invalid statistical analysis

Even the tiniest error messages can indicate an invalid statistical analysis

RStudio is reminding me of the older Macs

Articles by John Johnson

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