In science, a variable is something that can be changed, measured or controlled in an experiment. Scientists look at variables to understand how they affect things. A variable is any one of the things ...

Experimental design plays a crucial role in various research areas, providing a systematic framework for conducting experiments and obtaining reliable and interpretable results. Experimental design is ...

At times it is desirable to have independent variables in the model that are qualitative rather than quantitative. This is easily handled in a regression framework. Regression uses qualitative ...