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Home Online Courses Tree-Based Models (COURSE FULL) (TBMR01)
TBMR01

Tree-Based Models (COURSE FULL)

Learn decision trees, random forests, and boosted models in R. This one-day live online course covers CART, bagging, boosting, and model interpretation for applied data analysis.

  • Duration: 1 Days, 6 hours per day
  • Next Date: December 2, 2025
  • Format: Live Online Format
TIME ZONE

UK (GMT) local time - All sessions will be recorded and made available to ensure accessibility for attendees across different time zones.

£150Registration Fee

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5.0

from 200+ reviews

Course Description

This 1-day course provides an in-depth introduction to tree-based models in R. Decision trees and their ensemble extensions (random forests, bagging, and boosting) are among the most powerful and interpretable machine learning methods available. They can capture nonlinear relationships and complex interactions without requiring strict distributional assumptions, making them ideal for ecological, epidemiological, and applied data science problems. This course builds from the foundations of regression and classification trees to ensemble methods, with a strong emphasis on interpretability, model tuning, and practical implementation in R.

What You’ll Learn

During the course will cover the following:

  • Understand the logic and structure of decision trees for regression and classification.
  • Learn how tree models partition data and handle nonlinear relationships and interactions.
  • Implement and interpret CART (Classification and Regression Tree) models using R.
  • Understand overfitting, pruning, and model complexity control.
  • Fit and interpret ensemble tree methods, including bagging and random forests.
  • Apply boosted trees using xgboost or lightgbm for high-performance prediction.
  • Evaluate model accuracy using cross-validation and out-of-bag (OOB) error.

Interpret variable importance and partial dependence plots for explainability

Course Format

Interactive Learning Format

Each day features a well-balanced combination of lectures and hands-on practical exercises, with dedicated time for discussing participants’ own data, time permitting.

Global Accessibility

All live sessions are recorded and made available on the same day, ensuring accessibility for participants across different time zones.

Collaborative Discussions

Open discussion sessions provide an opportunity for participants to explore specific research questions and engage with instructors and peers.

Comprehensive Course Materials

All code, datasets, and presentation slides used during the course will be shared with participants by the instructor.

Personalized Data Engagement

Participants are encouraged to bring their own data for discussion and practical application during the course.

Post-Course Support

Participants will receive continued support via email for 30 days following the course, along with on-demand access to session recordings for the same period.

Who Should Attend / Intended Audiences

Target audience:  ecologists, environmental scientists, public-health analysts, data scientists, postgraduate students, and early-career researchers.

Assumed computer background: Basic experience using R and RStudio (e.g., importing data, running simple functions)

Assumed quantitative background: Familiarity with descriptive statistics and linear regression concepts.

Required statistical experience: Familiarity with linear models is helpful but not essential – concepts will be reviewed

Not required but helpful: Experience with data wrangling (e.g., using dplyr or tidyr), basic plotting with ggplot2, and reading model output

Equipment and Software requirements

A laptop or desktop computer with a functioning installation of R and RStudio is required. Both R and RStudio are free, open-source programs compatible with Windows, macOS, and Linux systems.

A working webcam is recommended to support interactive elements of the course. We encourage participants to keep their cameras on during live Zoom sessions to foster a more engaging and collaborative environment.

While not essential, using a large monitor—or ideally a dual-monitor setup—can significantly enhance your learning experience by allowing you to view course materials and work in R simultaneously.

 

All necessary R packages will be introduced and installed during the workshop. A comprehensive list of required packages will also be shared with participants ahead of the course to allow for optional pre-installation.

Download R Download RStudio Download Zoom

Dr. Niamh Mimnagh

Dr. Niamh Mimnagh

Niamh is a statistician working at the interface of ecology, epidemiology, and data science. Her research focuses on applying and developing statistical and machine learning methods to address real-world challenges such as estimating species population sizes from count and trace data and predicting livestock disease re-emergence using sparse or imbalanced datasets. She works with a wide array of statistical approaches, including Bayesian hierarchical models, N-mixture models, anomaly detection algorithms, and spatial analysis techniques.

 

Niamh earned her PhD in Statistics, with a focus on multispecies abundance modelling, and holds a first-class MSc in Data Science. Alongside her research, she is actively engaged in science communication and education, running a popular blog on applied statistics for non-specialists, and regularly delivering workshops and guest lectures on topics such as GLMs and machine learning with imbalanced data.

 

Education & Career

  • PhD in Statistics (Multispecies Abundance Modelling)
  • MSc in Data Science (First Class Honours)
  • Instructor, consultant, and science communicator in statistical ecology and epidemiology

 

Research Focus

Niamh’s work centres on extracting meaningful insights from complex ecological and epidemiological data. She is particularly interested in population estimation techniques and predictive modelling for conservation and disease management, using advanced statistical tools and reproducible workflows.

 

Current Projects

  • Development of Bayesian and ML approaches for estimating species abundance from imperfect data
  • Modelling livestock disease risk using spatial and temporal predictors
  • Creating accessible educational materials for teaching applied statistics in R

 

Professional Consultancy

Niamh provides expert statistical support to academic and applied research projects, with a focus on ecological monitoring, conservation planning, and disease modelling. She also advises on study design and data workflows for interdisciplinary teams.

 

Teaching & Skills

  • Teaches topics including GLMs, Bayesian statistics, machine learning for imbalanced data, and spatial statistics in R
  • Advocates for reproducibility, open science, and accessible statistical training
  • Experienced in communicating complex methods to broad audiences

 

Links

 

Session 1 – 01:20:00 – Introduction to Decision Trees
We begin with the theory behind decision trees for regression and classification. Topics include recursive partitioning, splitting criteria (Gini impurity, deviance, variance reduction), and visualising tree structures. Participants will build and interpret simple trees using the rpart and rpart.plot packages, exploring how trees model nonlinear relationships and interactions naturally.

 

Session 2 – 01:20:00 – Controlling Complexity and Avoiding Overfitting
This session covers model tuning, pruning, and cross-validation. Participants will learn how to interpret complexity parameters (cp) and select the optimal tree size. We also discuss bias–variance trade-offs and demonstrate how pruning can improve generalisation.

 

Session 3 – 01:20:00 – Ensemble Methods: Bagging and Random Forests
We introduce ensemble learning as a solution to instability in single trees. Participants learn the concept of bootstrap aggregation (bagging) and how random forests improve predictive accuracy by reducing variance. The session includes implementation in R with randomForest and ranger, interpretation of variable importance metrics, and assessing out-of-bag error.

 

Session 4 – 01:20:00 – Boosted Trees and Model Interpretation
The final session focuses on boosting algorithms such as xgboost and lightgbm. We explain how boosting sequentially builds strong models from weak learners, and demonstrate parameter tuning, feature importance plots, and SHAP or partial dependence plots for interpretation. The session concludes with a comparative case study evaluating tree-based methods on a real dataset.

Testimonials

PRStats offers a great lineup of courses on statistical and analytical methods that are super relevant for ecologists and biologists. My lab and I have taken several of their courses—like Bayesian mixing models, time series analysis, and machine/deep learning—and we've found them very informative and directly useful for our work. I often recommend PRStats to my students and colleagues as a great way to brush up on or learn new R-based statistical skills.

Rolando O. Santos

PhD Assistant Professor, Florida International University

Courses attended

SIMM05, IMDL03, ITSA02, GEEE01 and MOVE07

Testimonials

PRStats offers a great lineup of courses on statistical and analytical methods that are super relevant for ecologists and biologists. My lab and I have taken several of their courses—like Bayesian mixing models, time series analysis, and machine/deep learning—and we've found them very informative and directly useful for our work. I often recommend PRStats to my students and colleagues as a great way to brush up on or learn new R-based statistical skills.

Rolando O. Santos

PhD Assistant Professor, Florida International University

Courses attended

SIMM05, IMDL03, ITSA02, GEEE01 and MOVE07

Testimonials

PRStats offers a great lineup of courses on statistical and analytical methods that are super relevant for ecologists and biologists. My lab and I have taken several of their courses—like Bayesian mixing models, time series analysis, and machine/deep learning—and we've found them very informative and directly useful for our work. I often recommend PRStats to my students and colleagues as a great way to brush up on or learn new R-based statistical skills.

Rolando O. Santos

PhD Assistant Professor, Florida International University

Courses attended

SIMM05, IMDL03, ITSA02, GEEE01 and MOVE07

Frequently asked questions

Everything you need to know about the product and billing.

When will I receive instructions on how to join?

You’ll receive an email on the Friday before the course begins, with full instructions on how to join via Zoom. Please ensure you have Zoom installed in advance.

Do I need administrator rights on my computer?

Yes — administrator access is recommended, as you may need to install software during the course. If you don’t have admin rights, please contact us before the course begins and we’ll provide a list of software to install manually.

I’m attending the course live — will I also get access to the session recordings?

Yes. All participants will receive access to the recordings for 30 days after the course ends.

I can’t attend every live session — can I join some sessions live and catch up on others later?

Absolutely. You’re welcome to join the live sessions you can and use the recordings for those you miss. We do encourage attending live if possible, as it gives you the chance to ask questions and interact with the instructor. You’re also welcome to send questions by email after the sessions.

I’m in a different time zone and plan to follow the course via recordings. When will these be available?

We aim to upload recordings on the same day, but occasionally they may be available the following day.

I can’t attend live — how can I ask questions?

You can email the instructor with any questions. For more complex topics, we’re happy to arrange a short Zoom call at a time that works for both of you.

Will I receive a certificate?

Yes. All participants receive a digital certificate of attendance, which includes the course title, number of hours, course dates, and the instructor’s name.

When will I receive instructions on how to join?

You’ll receive an email on the Friday before the course begins, with full instructions on how to join via Zoom. Please ensure you have Zoom installed in advance.

Do I need administrator rights on my computer?

Yes — administrator access is recommended, as you may need to install software during the course. If you don’t have admin rights, please contact us before the course begins and we’ll provide a list of software to install manually.

I’m attending the course live — will I also get access to the session recordings?

Yes. All participants will receive access to the recordings for 30 days after the course ends.

I can’t attend every live session — can I join some sessions live and catch up on others later?

Absolutely. You’re welcome to join the live sessions you can and use the recordings for those you miss. We do encourage attending live if possible, as it gives you the chance to ask questions and interact with the instructor. You’re also welcome to send questions by email after the sessions.

I’m in a different time zone and plan to follow the course via recordings. When will these be available?

We aim to upload recordings on the same day, but occasionally they may be available the following day.

I can’t attend live — how can I ask questions?

You can email the instructor with any questions. For more complex topics, we’re happy to arrange a short Zoom call at a time that works for both of you.

Will I receive a certificate?

Yes. All participants receive a digital certificate of attendance, which includes the course title, number of hours, course dates, and the instructor’s name.

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TBMR01 ONLINE
TBMR01 ONLINE
£ 150.00
0 available
Sold Out
£150.00
1 December 2025 - 2 December 2025
Delivered remotely (United Kingdom), Western European Time Zone, United Kingdom
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