# 34511 - Biostatistics course Part 12 Association between...

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Biostatistics course Part 12 Association between two categorical variables Dr. Sc. Nicolas Padilla Raygoza Department of Nursing and Obstetrics Division Health Sciences and Engineering Campus Celaya-Salvatierra University of Guanajuato, Mexico

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Biosketch Medical Doctor by University Autonomous of Guadalajara. Pediatrician by the Mexican Council of Certification on Pediatrics. Postgraduate Diploma on Epidemiology, London School of Hygiene and Tropical Medicine, University of London. Master Sciences with aim in Epidemiology, Atlantic International University. Doctorate Sciences with aim in Epidemiology, Atlantic International University. Associated Professor B, Department of Nursing and Obstetrics, Division of Health Sciences, University of Guanajuato Campus Celaya Salvatierra. [email protected]
Competencies The reader will analyze the relationship between two categorical variables with two or more categories. He (she) will apply the Chi-squared test. He (she) will know the Chi-squared test for trends and when apply it.

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Introduction In part three, we learned how to tabulate a frequency distribution for a categorical variable. This tab shows how individuals are distributed in each category of a variable. For example, in a rural community in Celaya, a randomized sample of 200 people were asked about their level of socioeconomic status.
Introduction The table shows the distribution of individuals in each category Socioeconomic Index Level (SEIL). SEIL n % Low 50 25 Regular 110 55 High 40 20 Total 200 100

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Introduction When we examine the relationship between two categorical variables, tabulated one against other. This is a two way table or cross-tabulation. SEIL South Center North Low 33 7 10 Regular 9 81 20 High 2 8 30 Total 44 96 60
There is an association between two categorical variables, if the distribution of a variable varies according to the value of the other. The question we are interested in is: Is the level of SEIL varies by place of residence? To answer this question we need to assess a

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34511 - Biostatistics course Part 12 Association between...

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