Statistics for Orthopaedists

- Accuracy of a Test:
    - percentage of patients in which the test gives a correct answer;
    - the following equation is used to calculate accuracy:  (true positives + true negatives) / (true positives + true negatives + false positives and false negatives);

- Sensitivity:
    - refers to the ability of a test to pick up an abnormatily;
    - the following equation is used to calculate sensitivity: (true positives) / (true positive + false negatives)

- Specificity:
    - refers to the ability of a test to yield true positives;
    - the following equation is used to calculate specificity: (true negatives) / (true negatives + false positives)



Fundamentals of Statistics for Orthopaedists: Part IV.

Type-II error rates (beta errors) of randomized trials in orthopaedic trauma.

In Brief: The P Value: What Is It and What Does It Tell You?

In Brief: Standard Deviation and Standard Error

Statistics In Brief: When to Use and When Not to Use a Threshold P Value




Original Text by Clifford R. Wheeless, III, MD.

Last updated by Data Trace Staff on Thursday, January 3, 2013 10:38 am