Statistics

Descriptive Statistics Guide

Mean, median, mode, std dev.

Summarize data features.

Central Tendency

Mean: average
Median: middle
Mode: most frequent

Spread

Range: max-min
Variance: avg squared deviation
Std Dev: sqrt of variance

Frequently Asked Questions

Mean vs median?

Mean=average. Median=middle. Use median for skewed data.

When which?

Symmetric:mean. Skewed:median. Categorical:mode.

Std dev?

Avg distance from mean. Higher=more spread.