https://datatweets.com/courses/statistics/measures-of-center-and-variability/Recent content in Measures of Center & Variability on DATATWEETSHugoenCopyright (c) 2025 DatatweetsSat, 27 Jun 2026 09:00:00 +0200https://datatweets.com/courses/statistics/measures-of-center-and-variability/lesson-1-the-mean/Fri, 14 Nov 2025 09:00:00 +0200https://datatweets.com/courses/statistics/measures-of-center-and-variability/lesson-1-the-mean/Meet the most familiar statistic of all — the mean — its formula, how to compute it in pandas, why deviations from it always sum to zero, and how a whole-group mean is really a weighted blend of its subgroups.https://datatweets.com/courses/statistics/measures-of-center-and-variability/lesson-2-the-weighted-mean-and-the-median/Fri, 14 Nov 2025 09:00:00 +0200https://datatweets.com/courses/statistics/measures-of-center-and-variability/lesson-2-the-weighted-mean-and-the-median/Combine subgroup averages correctly with the weighted mean, compute the median for odd and even samples, and use the gap between mean and median as a quick skew diagnostic.https://datatweets.com/courses/statistics/measures-of-center-and-variability/lesson-3-the-mode/Fri, 14 Nov 2025 09:00:00 +0200https://datatweets.com/courses/statistics/measures-of-center-and-variability/lesson-3-the-mode/Meet the mode: the most common value in a column, the only average that works for nominal data, plus how to compute it with .mode() and value_counts() and how to choose between mean, median, and mode.https://datatweets.com/courses/statistics/measures-of-center-and-variability/lesson-4-measures-of-variability/Fri, 14 Nov 2025 09:00:00 +0200https://datatweets.com/courses/statistics/measures-of-center-and-variability/lesson-4-measures-of-variability/Learn why the center of a distribution is only half the story, then measure spread with the range, IQR, mean absolute deviation, variance, and standard deviation — including the population vs sample (n-1) distinction.https://datatweets.com/courses/statistics/measures-of-center-and-variability/lesson-5-z-scores/Fri, 14 Nov 2025 09:00:00 +0200https://datatweets.com/courses/statistics/measures-of-center-and-variability/lesson-5-z-scores/Learn the z-score — how many standard deviations a value sits from the mean — compute it in pandas, use it to flag unusual cars, compare mpg against weight, and test the empirical rule on real data.https://datatweets.com/courses/statistics/measures-of-center-and-variability/lesson-6-guided-project-profiling-fuel-economy/Fri, 14 Nov 2025 09:00:00 +0200https://datatweets.com/courses/statistics/measures-of-center-and-variability/lesson-6-guided-project-profiling-fuel-economy/The module capstone: play data analyst at a 1983 auto magazine, summarize fuel economy with center and spread, chart the year-by-year trend, compare regions of origin, and use z-scores to crown the standout cars.