1488 search results for "regression"

Permutation tests in R

May 21, 2012
By
Permutation tests in R

Permuation tests (also called randomization or re-randomization tests) have been around for a long time, but it took the advent of high-speed computers to make them practically available. They can be particularly useful when your data are sampled from unkown … Continue reading →

Read more »

Time-Series Policy Evaluation in R

May 21, 2012
By
Time-Series Policy Evaluation in R

Quantifying the success of government policies is clearly important. Randomized control trials, like those conducted by drug companies, are often described as the ‘gold-standard’ for policy evaluation. Under these, a policy is implemented in/to one area/group (treatment), but not in/to another (control). The difference in outcomes between the two areas or groups represents the effectiveness

Read more »

Criticism 4 of NHST: No Mechanism for Producing Substantive Cumulative Knowledge

May 18, 2012
By

In this fourth part of my series of criticisms of NHST, I’m going to focus on broad

Read more »

Example Reproducible Report using R Markdown: Analysis of California Schools Test Data

May 18, 2012
By
Example Reproducible Report using R Markdown:  Analysis of California Schools Test Data

This is a quick set of analyses of the California Test Score dataset. The post was produced using R Markdown in RStudio 0.96. The main purpose of this post is to provide a case study of using R Markdown to prepare a quick reproducible report. It provides examples of using plots, output, in-line R code, and...

Read more »

Stepping Outside My Open-Source Comfort Zone: A First Look at Golden Helix SVS

May 16, 2012
By
Stepping Outside My Open-Source Comfort Zone: A First Look at Golden Helix SVS

I'm a huge supporter of the Free and Open Source Software movement. I've written more about R than anything else on this blog, all the code I post here is free and open-source, and a while back I invited you to steal this blog under a cc-by-sa license....

Read more »

Stock market kurtosis over time

May 12, 2012
By

In the last decade we have observed an increase in computational power, information availability, speed of execution and stock market competition in general. One might think that, as a result, we are prone to larger shocks that occur faster than … Continue reading → Related posts: Kurtosis Interpretation When you google “Kurtosis”, you encounter many formulas...

Read more »

Criticism 1 of NHST: Good Tools for Individual Researchers are not Good Tools for Research Communities

May 10, 2012
By

Introduction Over my years as a graduate student, I have built up a long list of complaints about the use of Null Hypothesis Significance Testing (NHST) in the empirical sciences. In the next few weeks, I’m planning to publish a series of blog posts, each of which will articulate one specific weakness of NHST. The

Read more »

See R integrated with QlikView, Jaspersoft, Excel, and mobile apps

May 9, 2012
By

In yesterday's webinar, Revolution Analytics CTO David Champagne demonstrated how to integrate statistical graphics and analytic computations created using R software with a variety of third-party applications. In each case Revolution R Enterprise Server is running as a compute server to the client application, with R scripts launched on each user interaction via the RevoDeployR Web Services API. David...

Read more »

Use R! – Part 2

May 9, 2012
By
Use R! – Part 2

Here is a follow-up of my first post about using R. For our yearly KU Leuven Geology PhD Seminar (08-09/05/2012), I quickly pasted this script together from several examples I had run into in the past, as well as some things that I have been doing myse...

Read more »

Simple Spatial Correlograms for Cross-Country Analysis in R

May 9, 2012
By
Simple Spatial Correlograms for Cross-Country Analysis in R

Accounting for temporal dependence in econometric analysis is important, as the presence of temporal dependence violates the assumption that observations are independent units. Historically, much less attention has been paid to correcting for spatial dependence, which, if present, also violates this independence assumption. The comparability of temporal and spatial dependence is useful for illustrating why

Read more »