Linear regression with the same X value

[xeon123]

In a linear regression with 1 independent variable, if X is always the same (let's call I am unlucky), but Y present different values for the same X, I still can find the coefficient of the straight line equation?

 

[pasmith]

In a linear regression with 1 independent variable, if X is always the same (let's call I am unlucky), but Y present different values for the same X, I still can find the coefficient of the straight line equation?

The straight line would be parallel to the Y-axis, so it would be X = C where C is the one value of X.

 

[Number Nine]

If there is no variability in X, then X is certainly not going to do a very good job of explaining variability in Y.