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Variables
A variable is a measurable characteristic or attribute that can take on different values across cases (i.e., observational units such as people, companies, or time points). Types of Variables Variables can be classified by the type of values they ...
quartiles
Quartiles are the result of sorting quantitative variables and dividing the observations into four groups of equal sizes.
regression line
A kind of model used when both the outcome and explanatory variables are quantitative; a two-parameter model, the parameters being the slope () and y-intercept ().
null model
Null model uses the mean to model the distribution of a quantitative variable; called "null" because it does not have any explanatory variables; also called an empty model; sometimes referred to as a simple model because it is simpler than models ...
as.numeric()
The as.numeric() function will convert a factor or character value into a numeric value. For instance, if you need to change a factor such as `Gender` into numeric values, the as.numeric() function will assign each group a number and convert it from ...