when a trend variable is omitted in time series, what is the spurious correlation? what is spurious correlation in linear function when two time frames are trend stationary, what is a spurious correlation when two time series are trend stationary which is the omitted time trend variable? why is spurious correlation is y_t$ a deterministic time trend? when is the spurious regression if y_t$ is a trend stationary what is spurious correlation how to prove that the correlation is spurious if two time series are trend stationary, then regressing $x_t$ results in a spurious correlation. when you regress a variable of $x_t, what happens to the correlation what is spurious correlation what type of correlation is a spurious correlation? what type of correlation is the spurious correlation? how to get spurious correlation is spurious correlation deterministic when is a spurious correlation found what is a spurious correlation based on time trend when is spurious correlation true