The Analysis of Categorical Data- Summarising a binary variable

Question 1

What parameters can you use to measure binary variables

Answer 1

π- PROPORTION OF THE POPULATION POSSESSING THE ATTRIBUTE IN QUESTION
π- is UNKOWN
It is the equivalent interpretation that it is the probability that a randomly chosen member of the population has the attribute

Question 2

How to measure π

Answer 2

r/n or if you wish to express it on a percentage than 100r/n%
r= the sample of (n) patients from a population that possess the attribute

Question 3

Why do we need new methods?

Answer 3

-Binary variable only has one parameter π which is an analog of the mean (u) of a continuous population
- Need to consider standard error
- Once π has been estimated there is no need for further estimation of spread