Specific tests Flashcards
Chi square test
definition and assumptions
for both 2 and 2+ groups, chi square test compares group proportions and if they are different from that expected by chance
assumption: usually chi-square distribution fro nominal type data
no cell with expected count of <5
Fisher’s exact test
like chi, but good for groups of 2 or more with EXPECTED cell count of 5+
McNemar Test
2 groups, and if they are from same group
Cochran
same principle as chi square and assumptions, yet mathematical factors in concept of paired or related data
Log Rang
Nominal, compares proportions of, or time to, event occurences between groups
Contingency coefficient
nominal, correlation test
provides a quantitative measure of the strength and direction of a relationship between variables
r = values range from ( -1.- + 1.0 )
Logistic Regression
provides a measure if the relationship between variables by allowing the prediction about the dependent variable, or outcome, knowing the value/rank of others independent variables (IVs)
alos able to calculate OR for a measure of association
bonferroni test of inequality
adjusts the p value for # of comparisons being made
VERY conservative
Mann-Whitney test
2 groups, independent
same as X^2 but for ordinal data
Wilcoxon Signed Rank test
for related data of 2 groups
compares median values between groups
Friedman test
compares the median values between groups
if 3+ group comparison significant, must perform post-hox test to determine where differences are
Student Newman-Keul test
post-hoc test for 3 or more group comparisons
compares all pairwise comparisons possible
all groups must be equal in size
Dunnett test
post-hoc test for 3 or more group comparisons
compares all pairwise comparisons against a single control
all groups must be equal in size
Dunn test
post-hoc test for 3 or more group comparisons
compares all possible multiple comparisons
useful when all groups are not equal size
student t test
2 groups, interval data
compares the mean values between groups
