I would like to estimate relationships among soil CO₂ efflux, soil temperature and soil moisture under experimental drought condition.
I set the variables like below.
Dependent variable (Y): soil CO₂ efflux
Independent variable (Xn): soil temperature, soil moisture, drought day
So, the regression model would be
Y = b₁ + b₂X₁ + b₃X₂ + b₄X₃
(or with less variables..)
Here, I wonder if I can use 'drought day' variable in this analysis.
I attached sample data here too.