In a clinical survey, 215 patients with pulmonary heart disease ( 肺心病 ) in a hospital were collected , of which 164 patients have taken digitalis ( 洋地黄 ) and 51 patients haven’t taken it. Each of them received an ECG examination. The results are listed in Table 6.2.
6.3 The 2 Tests for Binary Variable under a Paired Design
Example 6.2 There are 260 serum ( 血清 ) samples. Each sample is divided into two and tested by two different methods of immunological test of rheumatoid factor( 类风湿因子 ) respectively. The results are listed in Table 6.4. Now the question is that results of two methods are independent or not.
test for independence between two binary variables 2 =173.74 Example 6.2 12/80=15% 172/180=95%
6.3.2 Comparison between two sample proportions