349 search results for "anova"

Analysing longitudinal data: Multilevel growth models (II)

September 5, 2015
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Analysing longitudinal data: Multilevel growth models (II)

This is the third post in the longitudinal data series. Previously, we introduced what longitudinal data is, how we can convert between long and wide format data-sets, and a basic multilevel model for analysis. Apparently, the basic multilevel model is not quite enough to analyse our imaginary randomised controlled trial (RCT) data-set. This post is

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Getting started in applied statistics / datascience

August 29, 2015
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Getting started in applied statistics / datascience

Where to start to start? I was recently asked by a colleague manager from another organisation what direction they could give to a staff member interested in building skills in the whole “big data” thing. A search of the web shows hundreds if not thousands of sites and blog posts aimed at budding data scientists, but most of them...

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Evaluating Logistic Regression Models

August 17, 2015
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Evaluating Logistic Regression Models

Logistic regression is a technique that is well suited for examining the relationship between a categorical response variable and one or more categorical or continuous predictor variables. The model is generally presented in the following format, where β refers to the parameters and x represents the independent variables. log(odds)=β0+β1∗x1+...+βn∗xn The log(odds), or log-odds ratio, is defined

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Count data: To Log or Not To Log

July 22, 2015
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Count data: To Log or Not To Log

Count data are widely collected in ecology, for example when one count the number of birds or the number of flowers. These data follow naturally a Poisson or negative binomial distribution and are therefore sometime tricky to fit with standard LMs. A traditional approach has been to log-transform such data and then fit LMs to

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Count data: To Log or Not To Log

July 22, 2015
By
Count data: To Log or Not To Log

Count data are widely collected in ecology, for example when one count the number of birds or the number of flowers. These data follow naturally a Poisson or negative binomial distribution and are therefore sometime tricky to fit with standard LMs. A traditional approach has been to log-transform such data and then fit LMs to

Read more »

Connecting R to Everything with IFTTT

June 18, 2015
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Connecting R to Everything with IFTTT

IFTTT ("if this then that") is one of my favorite tools. I use it to keep and share articles, turn on my home's lights at sundown, alert me when certain keywords are mentioned on Twitter/Reddit/etc., and many other things. Recently, the great people at IFTTT announced the Maker Channel, which allows recipes to make and receive web requests. This...

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Connecting R to Everything with IFTTT

June 18, 2015
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Connecting R to Everything with IFTTT

IFTTT (“if this then that”) is one of my favorite tools. I use it to keep and share articles, turn on my home’s lights at sundown, alert me when certain keywords are mentioned on Twitter/Reddit/etc., and many other things. Recently, the great people at IFTTT announced the Maker Channel, which allows recipes to make and receive...

Read more »

Connecting R to Everything with IFTTT

June 18, 2015
By
Connecting R to Everything with IFTTT

IFTTT (“if this then that”) is one of my favorite tools. I use it to keep and share articles, turn on my home’s lights at sundown, alert me when certain keywords are mentioned on Twitter/Reddit/etc., and many other things. Recently, the great people at IFTTT announced the Maker Channel, which allows recipes to make and receive...

Read more »

advanced.procD.lm for pairwise tests and model comparisons

June 9, 2015
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In geomorph 2.1.5, we decided to deprecate the functions, pairwiseD.test and pairwise.slope.test.   Our reason for this was two-fold.  First, recent updates by CRAN rendered these functions unstable.  These functions depended on the mode...

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Paper Helicopter Experiment, part III

May 31, 2015
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Paper Helicopter Experiment, part III

As final part of my paper helicopter experiment analysis (part I, part II) I do a reanalysis for one more data set. In 2002 Erik Erhardt and Hantao Mai did an extensive experiment, see The Search for the Optimal Paper Helicopter. They did a number of s...

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