Question

Asked Sep 21, 2019

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is finding a linear correlation coefficient the same as finding the correlation coefficient? if not, an example of linear correlation coefficient would help.

Step 1

The type of coefficient to be calculated would depend on whether the variables are categorized as nominal, ordinal or interval data. When both variables are nominal, for an instance, Phi ecefficient is used. When both variables are ordinal Spearman Rank correlation coefficient is used.

For linear relationship, Pearson product-moment correlation coefficient is used. This correlation coefficient gives us an idea about the linear relationship between the two variables. Correlation coefficient is loosely used in texts to mean Pearson product-moment correlation coefficient.

The formula for calculating this correlation coefficient is:

Step 2

Now let's consider an example: suppose we have 6 individuals and we want to see how the age of these individuals is related with their glucose level. The data is given below:

Step 3

Now we can find the correlation coefficient for the given dat...

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