Link: Probability

When stack data into bins (range), we get Histogram.

We use a curve to approximate the histogram.

Both the histogram and the curve are distibutions, which shows how the probability of measurements are distributed.


  • It’s more informative, because it’s not limit to discret data points/range.
  • It’s more precise, because the curve is also not limited by the width of bins (range).
  • For limited data points, use the approximate curve based on mean and sd is usually good enough

Distribution can have many shapes.