In this post I’ll briefly introduce how to use ggplot2 (ggplot), which by default makes nicer looking plots than the standard R plotting functions. The first thing to know is that ggplot requires data frames work properly. It is an entirely different framework from the standard plotting functions in ...

Let’s get psychometric and learn a range of ways to compute the internal consistency of a test or questionnaire in R. We’ll be covering: Average inter-item correlation Average item-total correlation Cronbach’s alpha Split-half reliability (adjusted using the Spearman–Brown prophecy formula) Composite reliability If you’re unfamiliar ...

Speaker of the [R] Kenntnis-Tage 2016: Eugene Harschack | Decadis AG Eugene Harschack works in the Business Intelligence Solution department at Decadis, where he implements BI solutions for customers. Decadis is an independent IT consulting firm which supports customers in planning, implementing and operating IT infrastructures. The department Business Intelligence Solutions deals ...

I have to admit to being a bit of a snob when it comes to graphs and charts in scientific papers and presentations.  It’s not like I think I am particularly good at it – I’m OK – it’s just that I know what’s bad.  I’ve seen ...

Guest post by Jo Hardin ASA’s Prediction Competition In this election year, the American Statistical Association (ASA) has put together a competition for students to predict the exact percentages for the winner of the 2016 presidential election. They are offering cash prizes for the entry that gets closest to the ...

Speaker of the [R] Kenntnis-Tage 2016: Alexander Kruse | etracker GmbH Alexander Kruse works as a data analyst at etracker, a leading provider of products and services for optimizing websites and online marketing activities in Europe. By now, more than 110.000 customers are using etracker solutions, among them companies such as Jochen Schweizer, ...

Speaker of the [R] Kenntnis-Tage 2016: Julian Gimbel | Lufthansa Industry Solutions Julian Gimbel works as a data scientist at Lufthansa Industry Solutions. The company supports customers in digitalizing and automating their processes in order to increase their turnover and efficiency while simultaneously reducing their costs. In his guest lecture working efficiently ...

Off lately a considerable number of winner machine learning enthusiasts have used XGBoost as their predictive analytics solution. This algorithm has taken a preceedence over the traditional tree based algorithms like Random Forests and Neural Networks...

Off lately a considerable number of winner machine learning enthusiasts have used XGBoost as their predictive analytics solution. This algorithm has taken a preceedence over the traditional tree based algorithms like Random Forests and Neural Networks. The acronym Xgboost stands for eXtreme Gradient Boosting package. The creators of this algorithm ...