An R Function for Cronbach’s Alpha Analysis: A Case-Based Approach

Himani Kotian; Aiswarya  Liz Varghese; Rohith Motappa

doi:10.55489/njcm.130820221149

Authors

Himani Kotian Kasturba Medical College, Mangalore, Manipal Academy of Higher Education, Manipal, India
Aiswarya Liz Varghese Kasturba Medical College, Mangalore, Manipal Academy of Higher Education, Manipal, India
Rohith Motappa Kasturba Medical College, Mangalore, Manipal Academy of Higher Education, Manipal, India

DOI:

https://doi.org/10.55489/njcm.130820221149

Keywords:

Internal consistency, Reliability, Cronbach’s alpha

Abstract

Cronbach’s alpha is a very commonly used method in biomedical research. Cronbach’s alpha Indicates the extent to which the items in your questionnaire are related to each other, a useful coefficient for assessing the internal consistency of the items. Although this method is commonly used in medical research, the statistical software packages do not have the direct menu-driven operation for Cronbach’s alpha. Hence this paper intends to provide an R function (Cronbach. Alpha) for Cronbach’s alpha analysis.

References

Bland JM, Casey ATH, Crockard HA, Stevens J,Moskovich R, Ransford AO, Development of a functional scoring system for rheuma-toid arthritis patients with cervical myelopathy Ann Rheum Dis

McKinley RK,Manku-Scott T, Hastings AM , French DP,Baker R.Reliability and validity of a new measure of patient satisfaction with out of hours primary medical care in the United Kingdom;development of a patient questionnaire. BMJ 1997;314:193-8. Doi: https://doi.org/10.1136/bmj.314.7075.193 PMid:9022436 PMCid:PMC2125677

Bosma H.Marmot MG,Hemingway H,Nicholson AC, Brunner E,Stansfield SA.Low job control and risk of coronary heart disease in whitehall II(prospective cohort)study, BMJ 1997;314;558-65 . Doi: https://doi.org/10.1136/bmj.314.7080.558 PMid:9055714 PMCid:PMC2126031

Cronbach LJ. Coefficient alpha and the internal structure of tests. Psychometrika 1951;16:297-333. Doi: https://doi.org/10.1007/BF02310555