statistical test

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STATISTICAL TESTS

WILCOXON SIGNED RANK TEST

2 dependent samples

KRUSKAL-WALLIS

Unpaired/independent samples

CHI SQUARE TEST

Characteristics

nominal data

displayed in contingency table

categorical variable

random sampling method

Only one sample

CORRELATION

Spearman's rank

not normally distributed

ordinal or interval variable

Pearson's product-moment

approximately normally distributed

interval variable

Relationship between variables

strength of relationship

positive or negative relationship

REGRESSION

Prediction

Equation

R2 - coefficient of determination

Y = a + bX

Models

one independent

one dependent

MANN-WHITNEY TEST

Non-parametric test

Not normally distributed

2 independent samples

TWO-WAY ANOVA

Same sample size

Samples normally distributed

ONE-WAY ANOVA

From normal distribution

Unpaired/independent sample

3 or more samples

DEPENDENT T-TEST

Same subjects

eg 2: marital status

single

after

before

INDEPENDENT T-TEST

Parametric test

Different subjects

eg 2: teeth location

maxillary

mandibular

eg 1: gender

female

male

Two conditions