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.

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