Nonparametric Models

Question 1

When do you use nonparametric models?

Answer 1

when the assumptions of parametric tests haven’t been met

Question 2

statistic

Answer 2

sample

Question 3

parameter

Answer 3

population

Question 4

what does ranking help with

Answer 4

outliers, skew

Question 5

what are the non-parametric equivalents of the independent t-test

Answer 5

wilcoxon-rank sum

mann0whitney

Question 6

what assumptions are we concerned about with small n

Answer 6

normality, homogenity of variences

Question 7

small effect size

Answer 7

0.1

Question 8

medium effect size

Answer 8

0.3

Question 9

large effect size

Answer 9

0.5

Question 10

how do you rank data

Answer 10

find the lowest score, give it a score of 1, find the next lowest, give it a score of 2, etc

Question 11

purpose of wilcoxon rank-sum and mann whitney tests

Answer 11

use when you want to compare distributions in 2 conditions and these conditions contain different entities and the resulting data has unusual data or violates assumptions

Question 12

fxn of kolmogorov-smirov z

Answer 12

tests whether 2 groups have been drawn from the same population

Question 13

fxn of moses extreme reactions

Answer 13

compares variability of scores in 2 groups

Question 14

what test is the moses extreme reactions similiar to?

Answer 14

levene’s test

Question 15

fx of the wald-wolfowitz runs

Answer 15

looks for runs of scores from the same group w/in the ranked order

Question 16

what do you need to report for mann-whitney test results

Answer 16

test statistic (U), effect seize, exact values of p

Question 17

test statistic T

Answer 17

from Wilxocon signed-rank test

sum of positive ranks

Question 18

what do you report in wilcoxon signed-rank test?

Answer 18

test statistic (T), exact significance, effect size

Question 19

what does it mean if wilcoxon signed-rank test statistic is <0.05

Answer 19

the 2 conditions are significantly different

Question 20

when you rank data in wilcoxon signed-rank what do you do with the sign?

Answer 20

ignore it

Question 21

when do you use the kruskal -wallis test

Answer 21

comparing several independent groups when assumptions have been broken

Question 22

what can the kruskal-wallis be considered a nonparametric equivilant of?

Answer 22

one-way independent ANOVA

Question 23

What do you report for kruskal-wallis test?

Answer 23

test statistic H, degrees of freedom, significance, effect size

Question 24

what does jonckheere-terpstra test do

Answer 24

tests for an ordered pattern to the medians of the groups you’re comparing

Question 25

step-down methods

Answer 25

identify groups that are the “same” (homogenious)