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Correlation Discussion - Essay Example

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The paper "Correlation Discussion" gives detailed information about different methods of establishing correlation among variables and provides an example of each. It discusses the advantages and disadvantages of each method and where each must be applied…
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Download file to see previous pages Fisher’s z-Transformation (Zr) is another method which enables a skewed sampling distribution to be transformed into a normal distribution scheme. In particular, this may be applied when the value of r (Pearson’s product-moment correlation coefficient) deviates from zero, in which case, the sampling distribution becomes skewed progressively and Fisher’s z-transformation may resolve to normalize this condition. Though the mean and variance do not follow a common transformation, functions pertaining to cumulative distribution and probability density can still be determined statistically via such method. The following graph demonstrates how ‘zr’ varies with ‘r’.Evaluation of Pearson ‘r’, on the other hand, may indicate the correlation between two variables based on tests to figure whether the ‘r' varies from -1 to +1, with 0 in reference to the absence of relationship and 1 for the perfect relationship. Test reports with this method incorporate critical one-tailed and two-tailed ‘r’, Fisher z-transformation, t-statistic, and population correlation figures.Calculating Spearman’s rank-order correlation non-parametric coefficient ‘ρ’, likewise, formulates a nearly similar output as does measuring the Pearson’s ‘r’. It takes two numeric variables to carry out the method through which each variable is converted to ranks.  ...Download file to see next pagesRead More
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