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The unique slope formula is unavailable if all x values are identical. In this case, the denominator of the slope formula, which is the sum of squared deviations of x from its mean, becomes zero.

Conditions: All observed x values are identical.; The model attempts to fit a line with a unique slope.

The unique slope formula is unavailable if all x values are identical. In this case, the denominator of the slope formula, which is the sum of squared deviations of x from its mean, becomes zero.

Conditions: All observed x values are identical.; The model attempts to fit a line with a unique slope.