These WINKS statistics tutorials explain the use and interpretation of standard statistical analysis techniques for Medical, Pharmaceutical, Clinical Trials, Marketing or Scientific Research. The examples include how-to instructions for WINKS SDA Version 6.0 Software. Download evaluation copy of WINKS.
Description of Options for
WINKS Crosstabulation Analysis (Chi-square)
Notes on 2x2 Table Statistics
Several other specialized statistics are provided for 2x2 tables. They
do not apply to the previous example, but are typically used in a medical
setting where the variables are often exposure to a disease (or some
stimulus) versus the observation of some outcome – for example smoking vs
cancer or exposure to a chemical vs pulmonary disease. When your data are
in that setting, the risk statistics given by Relative Risk, Odds Ratio,
Sensitivity and Specificity may be useful:
Note: Sensitivity and Specificity calculations are only available
on the crosstabulations with data entered from the keyboard. Results are
based on a table where the cells are in the following pattern:
TP | FP
FN | TN
Where T=True, F=False, P=Positive, and N=Negative.
Specificity is a measure of the ability to call negative
patients/subjects that do not have the disease or condition. For more
information on these four statistics, reference any biostatistics or
epidemiology text. One example is Basic Biostatistics in Medicine and
Epidemiology, A. A. Rimm, Appleton-Century-Crofts, 1980.
Definition of Cell Options