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Numeric variables
Quantitative - measurable
can be either continuous or discrete
Continuous variables
They can take any value within a range
Discrete variables
They can take specific values within a range
Categorical variables
Qualitative
can be either normal categorical, ordered categorical or binary
Normal Categorical
Divided into different categories, not in a ordered way
Ordered Categorical
Divided into different categories in an ordered way
Binary
Divided into only 2 categories (e.x. Yes or No)
Kinds of scales regarding Numeric variables
Interval scale (no real 0)
Ration Scale (real 0 exists)
Kinds of scales regarding Categorical variables
Nominal scale (divided into different categories, not in an ordered way)
Ordinal scale (divided into different categories in an ordered way)
Measures of central tendency
mean, median(middle point), mode(the most common value)
Measures of dispersion
**dispersion means how much i expect my variable to vary/spread around the central location
variance, standard deviation, interquartile range
Q1
25% is smaller than the value and the rest 75% is bigger
Q2
50% is smaller than the value and the rest 50% is bigger
Q3
75% is smaller than the value and the rest 25% is bigger
IQR =
Q3-Q1
Standard Deviation
The average distance from the mean
the BIGGER the ST, the BIGGER the spread