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variables
Variables are the attributes of some object. For example, Height is a variable in Fingers because it is an attribute of the people that were measured. Variables are often represented as columns in a data frame.
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 factorial value into a numeric value. For instance, if you need to change a factor such as `Sex` into numeric values, the as.numeric() function will assign each group a number and convert it from being coded ...