UCLA STAT 13
Introduction
to Statistical Methods for the Life and Health Sciences
1-dimensional tables
classify n-individuals in J-categories
Chi-Square Test goodness of fit test
Example of 1D table Three blood types
Example of 1D table rolling a single die
Lotto after 399 numbers
have been drawn
Do some numbers appear more frequently in LOTTO?
Lotto after 399 numbers
have been drawn
Do some numbers appear more frequently in LOTTO?
Melanoma by Site and Type, e.g., 4.6.2
Proportions of all 400
patients
entry = count/400
Remember plot/graph/look at your data first!
Remember plot/graph/look at your data first!
Chi-Square Test
(for
either homogeneity or independence)
Chi-square test output Cancer Type/Site
Dangers of collapsing tables -Simpsons paradox