R Statistical Tests

Question 1

t.test()

Answer 1

compares two groups, continuous, assumes normally distributed, equal variance,

Question 2

wilcox.test()

Answer 2

compares two groups, continuous, non-parametric, based off ranks

Question 3

lm() or aov()

Answer 3

compare 2+ groups, continuous, normal distribution and equal variance, parametric

Question 4

kruskal.test()

Answer 4

compare 2+ groups, continuous, nonparametric, based off ranks

Question 5

chisq.test()

Answer 5

compares tabular data, discrete (integer), numbers are independent, 5 or more better

Question 6

fisher.test()

Answer 6

compares tabular data, discrete (integer), numbers are independent, less than 5 better

Question 7

lm()

Answer 7

variable correlation, regression, continuous, relationships are linear, parametric

Question 8

nls()

Answer 8

variable correlation, non-linear, continuous, parametric

Question 9

glm()

Answer 9

compare 2+ groups, regression, flexible, combining different types of data