1885 search results for "time series"

Because it’s Friday: US Dialects

February 21, 2014
By
Because it’s Friday: US Dialects

In the video below from The Atlantic, the differences in the way US citizens describe or pronounce various things is illustrated in a series of phone calls (via Sullivan): If you're wondering how your dialect fits in, you can try the New York Times Dialect Quiz. Answer 25 questions, and it will identify the 3 US cities that most...

Read more »

Using Twitter as a Data Source For Monitoring Password Dumps

February 20, 2014
By
Using Twitter as a Data Source For Monitoring Password Dumps

I shot a quick post over at the Data Driven Security blog explaining how to separate Twitter data gathering from R code via the Ruby t (github repo) command. Using t frees R code from having to be a Twitter processor and lets the analyst focus on analysis and visualization, plus you can use t

Read more »

Books and lessons about ggplot2

February 19, 2014
By
Books and lessons about ggplot2

I recently got an email from a person at Packt publishing, who suggested I write a book for them about ggplot2. My answer, which is perfectly true, is that I don’t have the time, nor the expertise to do that. What I didn’t say is that 1) a quick web search suggests that Packt doesn’t

Read more »

ggplot2: Cheatsheet for Visualizing Distributions

February 18, 2014
By
ggplot2: Cheatsheet for Visualizing Distributions

In the third and last of the ggplot series, this post will go over interesting ways to visualize the distribution of your data.

Read more »

How to estimate the total cost of healthcare and why metal levels are useless

February 15, 2014
By
How to estimate the total cost of healthcare and why metal levels are useless

This is part 2/3 in my series on healthcare costs. The analysis is driven by my own needs as an …Continue reading »

Read more »

Interactive charts with rCharts

February 15, 2014
By

I have a few upcoming presentations as a part of job interviews. To prepare for these interviews, I'm attempting to make my figures a bit more interactive within my presentations. The aim is to be able to limit any large cumbersome tables I would need to include in my presentations and replace them with interactive plots that can...

Read more »

Three ways to call C/C++ from R

February 10, 2014
By
Three ways to call C/C++ from R

By Ben Ogorek Introduction I only recently discovered the fundamental connection between the C and R languages. It was during a Bay Area useR Group meeting, where presenter J.J. Allaire shared two points to motivate his talk on Rcpp. The first explained just how much of modern R really is C and C++. For...

Read more »

DailyMeteo.org – 2014 Conference

February 10, 2014
By
DailyMeteo.org – 2014 Conference

Our friend Stefan has been participating in MilanoR since the beginning, and was one of the people who started using R intensively after the "Introduction to R" Quantide course. Since he is from Belgrade (Serbia), and takes part in the … Continue reading →

Read more »

Detecting seasonality

February 7, 2014
By
Detecting seasonality

I occasionally get email asking how to detect whether seasonality is present in a data set. Sometimes the period of the potential seasonality is known, but in other cases it is not. I’ve discussed before how to estimate an unknown seasonal period, and how to measure the strength of the seasonality. In this post, I want to look at...

Read more »

Compare Regression Results to a Specific Factor Level in R

February 6, 2014
By

Including a series of dummy variables in a regression in R is very simple. For example,ols <- lm(weight ~ Time + Diet, data = ChickWeight)summary(ols) The above regression automatically includes a dummy variable for all but the first level of the factor of the Diet variable.Call:lm(formula = weight ~ Time...

Read more »