383 search results for "Anova"

Experimental Design Exercises

April 23, 2017
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Experimental Design Exercises

In this set of exercises we shall follow the practice of conducting an experimental study. Researcher wants to see if there is any influence of working-out on body mass. Three groups of subjects with similar food and sport habits were included in the experiment. Each group was subjected to a different set of exercises. Body Related exercise sets:

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Group-By Modeling in R Made Easy

April 18, 2017
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Group-By Modeling in R Made Easy

There are several aspects of the R language that make it hard to learn, and repeating a model for groups in a data set used to be one of them. Here I briefly describe R’s built-in approach, show a much … Continue reading →

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Hybrid content-based and collaborative filtering recommendations with {ordinal} logistic regression (2): Recommendation as discrete choice

April 14, 2017
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Hybrid content-based and collaborative filtering recommendations with {ordinal} logistic regression (2): Recommendation as discrete choice

In this continuation of “Hybrid content-based and collaborative filtering recommendations with {ordinal} logistic regression (1): Feature engineering” I will describe the application of the {ordinal} clm() function to test a new, hybrid content-based, collaborative filtering approach to recommender engines by fitting a class of ordinal logistic (aka ordered logit) models to ratings data from...

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Microeconomic Theory and Linear Regression (Part 1)

April 14, 2017
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Microeconomic Theory and Linear Regression (Part 1)

Introduction Last week I found a lot of materials I used as teaching assistant. Among those materials I found some class notes from Arne Henningsen, the author of micEcon R package. I'll use that package and some others to show some concepts from Microeconomic Theory. Packages installation: #install.packages(c("micEcon","lmtest","bbmle","miscTools")) library(micEcon) library(lmtest) library(stats4) #this is a...

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Microeconomic Theory and Linear Regression (Part 1)

April 14, 2017
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Microeconomic Theory and Linear Regression (Part 1)

Introduction Last week I found a lot of materials I used as teaching assistant. Among those materials I found some class notes from Arne Henningsen, the author of micEcon R package. I'll use that package and some others to show some concepts from Microeconomic Theory. Packages installation: #install.packages(c("micEcon","lmtest","bbmle","miscTools")) library(micEcon) library(lmtest) library(stats4) #this is a...

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Analyzing Accupedo step count data in R: Part 2 – Adding weather data

March 27, 2017
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Analyzing Accupedo step count data in R: Part 2 – Adding weather data

In my last set of posts, I wrote about analyzing data from the Accupedo step counter app I have on my phone. In this post, I'll talk about some additional analysis I've done by merging the step counter data with weather data from another source.The website www.wunderground.com has freely available weather data available for most parts of the...

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Success rates of appeals to the Supreme Court by Circuit

February 25, 2017
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Success rates of appeals to the Supreme Court by Circuit

In the chaos of the last month or so of United States of America governance, one item that grabbed my attention was the claim by President Trump that 80% of appeals decided by the Ninth Circuit Court of Appeal are overturned by the Supreme Court of the...

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When Size Matters: Weighted Effect Coding

February 24, 2017
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Categorical variables in regression models are often included by dummy variables. In R, this is done with factor variables with treatment coding. Typically, the difference and significance of each category are tested against a preselected ...

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Make Power Fun (Again?)

February 24, 2017
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Make Power Fun (Again?)

Make Power Fun (Again?) Brandon LeBeau University of Iowa Overview (G)LMMs Power simglm package Shiny Demo - Broken! Linear Mixed Model (LMM) Power Power is the ability to statistically detect a true effect (i.e. non-ze...

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Venture Capital Deals in 2016 – An Overview (2/2)

February 13, 2017
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Venture Capital Deals in 2016 – An Overview (2/2)

  In the previous post (mostly based on EDA principles) I highlighted the main features of 1,720 Venture Capital deals that took place in 2016 in 50 different countries. It is of a central importance to once again underline that the dataset that I used is not a representative sample Read More ...

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