An important step in determining the appropriate statistical test procedure is to know the type of variable we are observing. What is the independent variable and the dependent variable? After the variable is determined, then determine how to measure the variable (variable measurement scale)? If we already know/determine this, it will be easy for you to determine the appropriate statistical test procedure.
What is the Dependent Variable Measurement Scale?
Centering Size
- Mode
Spread Size
- Variation ratio (1 – relative frequency of modal class)
Frequency
- Absolute and Relative Frequency
Centering Size
- Median
Spread Size
- Variation ratio (1 – relative frequency of modal class)
Frequency
- Absolute and Relative Frequency
Centering Size
Is there an Extreme value?
- Ya → Median
- No → What is the form of distribution?
- Symmetrical → Mean
- Skewed → Median
Spread Size
What Centering Size is used?
- Mean → SD (Standard Deviation)
- Median → IQR (Interval Quartile Range)
Shape (shape)
What do you want to know about the shape of the data distribution?
- Symmetry → Skewness
- Peakedness → Kurtosis
- Normality → Shapiro-Wilk or Anderson-Darling test
Frequency
- Absolute and Relative Frequency
