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The method of least squares is used on time series data

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The method of least squares is used on time series data for
a. Eliminating the irregular movements
b. de-seasonalizing the data
c. obtaining the trend equation
d. exponentially smoothing a series

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The solution provides answer based on detailed explanations of the method of least squares used on time series data.

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The method of least squares is often used on time series data for predicting trendline. ...

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