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Correlation
Write down the steps involved in step deviation method of calculating correlation co-efficient.
Step deviation method of calculating correlation co-efficient: This method involves the following steps:
1. Take any convenient value in X and Y series as assumeed value Ax and Ay.
2. With the help of assumed mean of both the series, deviation of the values of individual variable i.e. dx (X-A) and dy (Y-A) are calculated.
3. Now divide dx and dy by some common factor as dx = dx/cl and dy/c2 = where c1 is common factor for series X and C2 is common factor for series. Y ‘dx’ and dy are step deviations.
4. Multiply the step deviations of the two series and get dx' dy'
5. Add the dx', dy', and get Σdx'edy'
6. Square the dx and dy' and add to find out Σdx 2 and Σdy 2
7. Apply the following formula to calculate co- efficient of correlation.
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The unit of correlation coefficient between height in feet and weight in kgs is:
The range of simple correlation coefficient is:
If rxy is positive the relation between X an Y is of the type:
If rxy = 0 the variable X and Y are:
Of the following three measures which can measure any type of relationship:
If precisely measured data are available the simple correlation coefficient is:
Why is r preferrred to co-variance as a measure of association?
Can r lie outside -1 and 1 range depending on the type of data?
Does correlation imply causation?
When is rank correlation more precise than simple correlation coefficient?
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