If 
equals zero, the AD curve is:
Definitions:
Seasonal Indexes
Statistical factors used in time series analysis to adjust for seasonality and understand periodic fluctuations in data.
Regression Trend Line
A line on a scatter plot, derived from regression analysis, that shows the main trend of the relationship between two variables.
Mean Absolute Deviation
Mean absolute deviation is a measure of variability that represents the average absolute difference between each data point and the mean of the data set.
Sum of Squares
A statistical measure that quantifies the variance within a dataset by summing the squared differences between each value and the mean.
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