RSTHDA

Click here to use it.

Note that a software to compute correlation matrix is also available.

See also the top 3 correlation coefficient calculator

**Correlation coefficient** measures the level of the **association** between two variables (x and y). **Pearson correlation** analysis method is the most used one.

The **formula for the correlation coefficient is **:

\[ r = \frac{\sum{(x-m_x)(y-m_y)}}{\sqrt{\sum{(x-mx)^2}\sum{(y-my)^2}}} \]

\(m_x\) and \(m_y\) are the means of x and y variables.

The **correlation coefficient** can be negative, zero (no dependence) or positive.

The **formula** is described in details here.

Note that an online **correlation coefficient calculator** is available **here**.

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