How do you determine whether or not linear trend line

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How do you determine whether or not linear trend line or linear regression is a good forecasting method?

The MAD is within +/- 4.

The correlation coefficient is close to +1 or -1.

The slope of the regression line is positive.

The tracking signal is within +/- 4.

The correlation coefficient is within +/- 4.

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How do you determine whether or not linear trend line : How do you determine whether or not linear trend line or linear regression is a good forecasting method?

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