The scientists conducted experiments with helium variables.

Cepheid variables are important astronomical objects used to measure cosmic distances.

There are many cardinal variables in the dataset.

The researcher manipulated the independent variables in the experiment.

I need to declare several register variables in my program.

In statistics, continuous variables are measurements that can take on any value within a certain range.

In statistics, discrete variables are variables that can only take on specific values.

The researcher measured multiple dependent variables in the study.

The metasyntactic variables in the code are well-named.

In mathematics, free variables are symbols that can take on any value.