GraphPad Curve Fitting Guide

Key concepts: Gaussian

Key concepts: Gaussian

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Key concepts: Gaussian

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What is a frequency distribution?

All the equations in this section fit frequency distributions. The X values represent Y values in the original data set, and the Y values are the frequency or cumulative frequency.

Prism can create a frequency distribution from column data, using an analysis created for that purpose (called, of course, Frequency Distribution).

What is a cumulative frequency distribution?

A frequency distribution plots the number of observations as a function of value. A cumulative frequency distribution plots the cumulative number of observations as a function of value. Each Y value is the number of observations in the original data set that have a value less than or equal to the X value.

The Y values can be expressed as the counted number of observations, as fractions or as percentages.