Question

regression or correlation analysis if determining the relationship between the time it took to hold a breath and the change in breathing rate as a result of breath holding after a maximal inhale?

What would be the independent variable if regression? Dependent variable?

Answer 1

Dependent variable :Change in breathing rate

Independent varaiable: Breath hold time after maximum inhale

General rules of regression:

In regression Dependent variable is Y and it should be continuous.

Independent variable can be both categorical or continuous but in numerical.

Here dependent variable is unknown which is change in breathrate. So using independent variable we try to predict dependent variable.

Independent variable values can be collected using experiments like take random persons and measure breath hold time of each person. Since we have already a train set we can predict with that data.

Breath hold time increases there might be increase or decrease in breathing rate