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# Data Applied: Correlation

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Data Applied: Correlation

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### Data Applied: Correlation

1. 1. 5<br /> Data-Applied.com: Correlation<br />
2. 2. Correlation<br />In statistics, correlation and dependence are any of a broad class of statistical relationships between two or more random variables or observed data values<br />The most familiar measure of dependence between two quantities is the Pearson product-moment correlation coefficient, or "Pearson's correlation." <br />Data Applied also uses Pearson product-moment correlation coefficient as a measure of correlation<br />
3. 3. Pearson product-moment correlation coefficient<br />It is a value between +1 and −1 inclusive<br />It is widely used in the sciences as a measure of the strength of linear dependence between two variables<br />Pearson's correlation coefficient between two variables is defined as the covariance of the two variables divided by the product of their standard deviations:<br />
4. 4. Calculation<br />For a variable Xi where i varies from 1 to N by :<br />mean (M)= summation (Xi)/N<br />standard deviation (S) = (summation(Xi-M)^2/N)^(1/2)<br />Substitute these values and get the correlation <br />
5. 5. Correlation using Data Applied’s web interface<br />
6. 6. Step 1: Selection of data<br />
7. 7. Step 2:Select Correlations<br />
8. 8. Step 3: Result<br />
9. 9. Visit more self help tutorials<br /><ul><li>Pick a tutorial of your choice and browse through it at your own pace.
10. 10. The tutorials section is free, self-guiding and will not involve any additional support.
11. 11. Visit us at www.dataminingtools.net</li>