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Chapter 7 |
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Correlation
http://www.socialresearchmethods.net/kb/statcorr.htm
This is the correlation section of William Trochim's Research Methods Knowledge Base. An example of a correlation is presented, and a clear presentation of the statistical calculation of the Pearson correlation coefficient is provided. In addition there is information on testing the statistical significance of correlations and correlation matrices. Several different types of correlation coefficients are discussed. A link to the discussion of levels of measurement is quite helpful when examining the different types of correlation coefficients. Information on the most current version of Trochim's web site or a printed copy of the text can be found at http://www.atomicdog.com/trochim. Information is also available on the use of this version of the site at http://www.socialresearchmethods.net/kb/. Additional sections of Trochim's web site relevant to correlational research are as follows.
Types of Relationships
http://www.socialresearchmethods.net/kb/relation.htm
This section presents a short but clear discussion of the nature of relationships and provides examples of positive and negative linear relationships as well as curvilinear relationships. Information on the most current version of Trochim's web site or a printed copy of the text can be found at http://www.atomicdog.com/trochim. Information is also available on the use of this version of the site at http://www.socialresearchmethods.net/kb/.
http://www.socialresearchmethods.net/selstat/ssstart.htm
This section is an interactive guide for selecting the appropriate statistic based on the number variables in the study and the level of measurement of these variables. Information on the most current version of Trochim's web site or a printed copy of the text can be found at http://www.atomicdog.com/trochim. Information is also available on the use of this version of the site at http://www.socialresearchmethods.net/kb/.
http://www.socialresearchmethods.net/kb/genlin.htm
This is a presentation of the basic issues related to general linear models. Students should find this quite helpful in their attempts to understand the nature of linear relationships. There is an excellent link in this section to multiple regression. Information on the most current version of Trochim's web site or a printed copy of the text can be found at http://www.atomicdog.com/trochim. Information is also available on the use of this version of the site at http://www.socialresearchmethods.net/kb/.
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