Statistics
Failures Stay Invisible: Survivorship Bias
Why do conclusions drawn only from what survived so often mislead us? This article explains survivorship bias: what it is and how it arises, the story of the World War II bombers,
Statistics
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46 articles found
Statistics
The Rule Hidden in the First Digit: Benford's Law
In many naturally occurring sets of numbers, smaller leading digits appear far more often: about 30.1% start with 1, and only about 4.6% with 9. This article explains the definitio
Statistics
Understanding Variables (Independent and Dependent Variables): Core Principles of Research
This article explains the concept and definition of variables in statistics, the difference between independent and dependent variables with examples from various fields, the disti
Statistics
The Normal Distribution: Practical Applications for Analysis and Prediction
The normal distribution plays a central role in statistics and data analysis. This article covers its basic concepts and characteristics, its mathematical definition and properties
Statistics
The Last One Is Always the Hardest: The Coupon Collector’s Problem
The coupon collector’s problem asks how many random draws it takes, on average, to collect every type at least once. Learn how the average is calculated, what the numbers look like
Statistics
Resampling to Measure Error: The Bootstrap (Bootstrapping)
Bootstrapping treats the sample you already have as if it were the population and resamples from it over and over to estimate error and confidence intervals. This article covers ho
Statistics
Just Moving People Raised Both Averages: The Will Rogers Phenomenon
The Will Rogers phenomenon is when moving some members from one group to another raises the averages of both groups. This article covers where the name came from and how it works,
Statistics
Judging Individuals by the Average: The Ecological Fallacy
The ecological fallacy is the mistake of assuming that conclusions drawn from group-level data apply equally to each individual in the group. This article covers how the name arose
Statistics
How Often Do Rare Events Happen: Poisson Distribution
Why do call-center phones arrive in uneven bursts even when the average is steady? This article walks through the Poisson distribution—from its single-parameter formula and conditi
Statistics
Methods for Managing Data Variability Using Standard Deviation
Standard deviation plays an important role in describing data variability and is an essential concept used in a wide range of practical situations. In data analysis and decision-ma