Lecture 10 correlation REGRESSION Xiaojin Yu Department of Epidemiology and Biostatistics, public Health school Southeast university
1 Lecture10 CORRELATION & REGRESSION Xiaojin Yu Department of Epidemiology and Biostatistics, public Health school, Southeast University
revew a Comparison of means t-test a Comparison of proportions Chi-square test Comparison of Median Rank sum test
2 review ◼ Comparison of means :t –test ◼ Comparison of proportions: Chi-square test ◼ Comparison of Median: Rank sum test
Review on rank sum test - raw data and Rank cardinal and ordinal number) Rank sum test methods based on rank a 2 independent groups willcoxon rank sum test 2 paired groups sign rank sum test
Review on rank sum test ◼raw data and Rank ( cardinal and ordinal number) ◼Rank sum test_ methods based on rank ◼2 independent groups_ willcoxon rank sum test ◼2 paired groups_ sign rank sum test 3
Solution to height comt p arison height between F and M 65 TM=52 T26 (N+1)12×13 78 2 N+1 6.5 ■B| ue-male ■Red-fema|e
Solution to height comparison height between F and M ◼ Blue-male ◼ Red- female 4 12 11 10 8 6 5 TM=52 9 7 4 3 2 1 Tf=26 6.5 2 1 78 2 12 13 2 ( 1) = + = = + N N N
eXAMPLE 9.1 Table 9.1 Survival Times of Cats rabbits without oxygen Cats r abb its minutes ra ink minutes rank 25 9.5 14 34 13 15 44 15 16 46 16 12345 17 19 18 6.5 19 6.5 20 23 25 89 5 28 30 12 35 n1=8 =127.5m2=12 T=82.5
5 EXAMPLE 9.1: Table 9.1 Survival Times of Cats & Rabbits without oxygen T2 n =82.5 2 T =12 1 n =127.5 1 =8 35 14 30 12 28 11 25 9.5 50 20 23 8 49 19 21 6.5 48 18 21 6.5 46 17 19 5 46 16 17 4 44 15 16 3 34 13 15 2 25 9.5 14 1 minutes rank minutes rank Cats rabbits