Monday, March 3, 2014

Pearson or Spearman?

Pearson assumes the rating scale is continuous. '
"Pearson's product-moment correlation coefficient (r) is based on the mean distance of data points from the line of best fit through the scattergram. This coefficient is intended for use with continuous interval level; variables but, as a convenience, in practice it is often used with ordinal variables" (Research method notes). 



Spearman assumes only that it is ordinal.
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The first line in each box is the correlation coefficient.
The second line is the statistical significance level for the coefficient.
Third line is the number of cases.

Coefficients with a significance level of less than .05 maybe taken to be statistically significant. "In communication, it is convention that if this value is less than .05, then the correlation is considered to 
be significant (meaning that the researcher can be 95% confident that the relationship between these two 
variables is not due to chance)".

How do I report Pearson's r APA style? 

Interrater reliability (Kappa)



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