• Users Online: 19
  • Print this page
  • Email this page
REVIEW ARTICLE
Year : 2021  |  Volume : 11  |  Issue : 1  |  Page : 31-38

Understanding statistical association and correlation


1 GRIPMER, SGRH, New Delhi, India
2 Department of Neonatology, SGRH, New Delhi, India, Indi

Correspondence Address:
Dr. Ramesh Lal Sapra
GRIPMER, SGRH, Rajinder Nagar, New Delhi - 110 060
India
Login to access the Email id

Source of Support: None, Conflict of Interest: None


DOI: 10.4103/cmrp.cmrp_62_20

Rights and Permissions

In medical research, the word ‘association’ and ‘correlation’ between two attributes/variables are frequently used and many times interchanged. Simplifying these concepts may help the researchers in applying the appropriate test. The article makes an attempt to simplify the concept of statistical association and correlation, especially for the clinical practitioners and researchers. The article discusses various measures of association and relationship for testing and assessing the strength. It also includes discussion on three popular measures of association used in medical research, namely odds ratio (OR), relative risk (RR) and hazard ratio which measure association of outcome between the two groups. Pearson Chi-square test is the most common test and has been extensively used for studying the association without bothering about its limitations or strength. Many times, researchers take it granted that the OR and RR are one and the same thing. Our calculations suggest us that with probabilities of outcome of 0.5 and 0.1, the OR is 9, whereas RR is 5. Tools for studying the statistical association and correlation should be used cautiously and appropriate tests to be used, particularly when assumptions are violated. While studying the association, its strength should be assessed using the appropriate statistics. OR and RR measure the association for assessing the risk. However, we should avoid equating OR with RR, particularly when the probabilities of outcome are not small.


[FULL TEXT] [PDF]*
Print this article     Email this article
 Next article
 Previous article
 Table of Contents

 Similar in PUBMED
   Search Pubmed for
   Search in Google Scholar for
 Related articles
 Citation Manager
 Access Statistics
 Reader Comments
 Email Alert *
 Add to My List *
 * Requires registration (Free)
 

 Article Access Statistics
    Viewed26    
    Printed0    
    Emailed0    
    PDF Downloaded2    
    Comments [Add]    

Recommend this journal