HarvardX Professional Certificate in Data Science vs Data Scientist with Python Career Track
Same Bayesian formula, same rubric — so the difference in scores reflects the difference in the courses, not the difference in how we evaluated them.
Harvard University (edX, PH125.x series by Rafael Irizarry) · AI & ML Courses
HarvardX Professional Certificate in Data Science
DataCamp · AI & ML Courses
Data Scientist with Python Career Track
Per-criterion
HarvardX Professional Certificate in Data Science
Nine-course breadth — R, visualisation, probability, inference, productivity tools, wrangling, linear regression, machine learning, capstone. Reviewers flag the Machine Learning course as poorly scaffolded with sharp difficulty jumps; the capstone is the strongest component.
Rafael Irizarry is a respected biostatistician (Simply Statistics, dsbook) and the content is academically solid. Pedagogically reviewers note examples pitched above true-beginner level and short videos that often defer to outside resources for depth.
One-time $792 for verified certificates across 9 courses (often discounted to ~$441), or free audit for everything except graded assignments and the certificate. Reviewers call paid accountability the main value lever, plus a modest Harvard CV signal.
Self-paced edX experience — no live TA, no office hours, peer-graded capstone with inconsistent feedback. HN and blog reviewers consistently report supplementing the lectures with DataCamp, YouTube and Stack Overflow rather than course forums.
Produces a real portfolio artefact (MovieLens recommender plus a self-chosen project) and a working R toolchain — RStudio, tidyverse, git. The honest gap is zero Python and zero SQL coverage; reviewers explicitly recommend pairing it before applying for analyst roles.
Data Scientist with Python Career Track
Scoring methodology applies identically to every course on the site — see the formula.