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03/02/2021
bmbstats – Bootstrap Magnitude-Based Statistics for Sports Scientists
By Mladen Jovanovic on 03/02/2021The aim of this book is to provide an overview of the three classes of tasks in statistical modeling: description, prediction, and causal inference.
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13/01/2020
Extending the Classical Test Theory with Circular Performance Model
By Mladen Jovanovic on 13/01/2020In this video, I will go more into these details and also provide an extension of this model, which I termed Circular Performance Model (CPM). CPM, in my opinion, better represent performance phenomenology we experience as coaches and athletes.
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24/01/2019
Statistical 101: Gender Salary Gap
By Mladen Jovanovic on 24/01/2019With this short article I wanted to showcase how easy is to jump to conclusions with simplistic statistical analysis using fake salary data. It is important to recognize that statistical analysis involve a lot of subjective decisions and cannot be claimed to be purely objective, but it is still way better than ignorance or ideology.
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17/12/2018
Predicting Non-contact Hamstring Injuries by Using Training Load Data and Machine Learning Models
By Mladen Jovanovic on 17/12/2018Research has shown that there is an association between training load and likelihood of suffering non-contact injuries. But can we predict the injury? In this paper I have tried to predict non-contact hamstring injury by using two seasons day-to-day training load data.
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04/12/2018
Fat Tails and Inequality
By Mladen Jovanovic on 04/12/2018The following R workbook is meant to show different effects (or should I call them inequalities or differences) between groups when different thresholds for selection are applied. Hopefully, this will be a good example on how it is important to be statistically educated when comparing groups and discussing inequality.
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10/11/2018
Smallest Worthwhile Change: Individual vs Group
By Mladen Jovanovic on 10/11/2018Smallest Worthwhile Change: Individual vs Group If you haven’t been living under a rock over past few years, you must be familiar with Will Hopkins work on magnitude-based inferences (MBI). One of the basis behind MBI is defining smallest practically meaningful change, or smallest worthwhile change (SWC). Together with Typical Error (TE) of a test, SWC is very needed...
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13/09/2018
Simple Sensitivity Analysis with R
By Mladen Jovanovic on 13/09/2018A sensitivity analysis is a technique used to determine how different values of an independent variable impact a particular dependent variable under a given set of assumptions. This technique is used within specific boundaries that depend on one or more input variables, such as the effect that changes in interest rates have on bond prices.
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23/08/2018
Data Preparation for Injury Prediction
By Mladen Jovanovic on 23/08/2018I have recently wrote a technical note (actually a video) for Sport Performance and Science Reports journal regarding Data Preparation for Injury Prediction. Both data and R core are available on GitHub repository.
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30/05/2018
Profiling Issues – Mind Your Target Variable
By Mladen Jovanovic on 30/05/2018This is VERY IMPORTANT concept and if you are doing any type of profiling, I urge you to watch this video.
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20/05/2018
Bootstrap Magnitude Based Predictions (BMBP)
By Mladen Jovanovic on 20/05/2018There has been a lot of fuss regarding Magnitude Based Inference (MBI) lately, peaking with the recent article and video by Kristin Sainani. The originators of MBI, Will Hopkins and Alan Batterham, recently posted their commentary of the critiques at sportsci.org. With the video below I wanted to give my opinion, but also provide rationale for “novel” techniques, that...