医学统计学英文课件-Chi-squareTes.pptVIP

* * * * * * * * * * * * * * * * * * Test for Categorical Variable Lesson Seven Objectives: 1. To master how to describe the enumeration data. 2. Chi-square tests for different designs in SPSS. 3. To understand the basic logic of Test and master the analyzing methods. 4. To master the Crosstabs procedure in SPSS for different designs. Discussion:1. What are the commonly used relative measures? Which can we calculate from the following data? Then compare the different relative measures. The deaths of infants with different weights, mothers’ pregnant periods and times of birthing 2. When we calculate the positive rate of serum antibody after the vaccination against measles, the denominator should be: A. the number of persons sensitive to measles B. the number of persons suffering from measles C. the number of persons vaccinated against measles D. the number of persons with anti-measles antibody after the vaccination 3. What is the basic logic of test? Example: Two methods were applied to test some diagnosed breast cancer cases, each case receiving one type of test. Method A was applied to test 70 cases and the positive rate was 60%. Method B was used to test 50 cases and the positive rate was 40%. Please compare the two positive rates by using test. 4. A physician did a survey of the roundworm infection in a rural region. There were 60 infected among the 300 randomly selected males, and 30 infected among the 200 randomly selected females.Q: (1) Did males and females have different infection rate? (2) How many persons should we prepare the medicine for if we want to apply the helminthic therapy to females? (The population of females : 8060) 5. Which of the following statements about test of R?C contingency table is/are correct? 1) Can’t be used for the fourfold table2) Can just be used to compare several sample rates 3) Can be used for the comparison of two proportions4) It suggests any