How do you know if an independent variable is categorical?
it simply depends on the nature (distribution) and the number of the variables that you are using. If the dependent variable is normally distributed and you have a categorical independent variable that has just 2 levels (dichotomous) then you use INDEPENDENT T TEST.
What does composite mean in research?
Definition. Measurement of an unobservable variable or construct by means of aggregating scores on several observable variables into an overall score. Composite scores can be computed either by using simple sums or averages or by performing transformations on the original variables.
What’s the difference between a variable and composite variable?
Lesson Summary. A variable is some characteristic shared by people in the population. A composite variable is a variable created by combining two or more individual variables, called indicators, into a single variable. Composite variables are used to measure multidimensional concepts that are not easily observed.
Can a variable be both independent and dependent?
No. The value of a dependent variable depends on an independent variable, so a variable cannot be both independent and dependent at the same time. It must be either the cause or the effect, not both! Can I include more than one independent or dependent variable in a study?
How many levels of independent variable can you apply?
You can apply just two levels (e.g. the new medication and the placebo) in order to find out if the independent variable has an effect at all. You can also apply multiple levels (e.g. three different doses of the new medication) to find out how the independent variable affects the dependent variable.
How is a composite variable easy to estimate?
Compared to latent variables, a composite variable is actually very easy to estimate: it is simply the sum of its indicators, hence the term composite. The way in which the indicators are summed depends on whether they are expected to have the same weight (a fixed composite) or different weights (a statistical composite ).