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Specifies how the trendline that smoothes out fluctuations in the data is calculated.
• exponential = 0
Uses an equation to calculate the least squares fit through points.
• linear = 1
Uses the linear equation y = mx + b to calculate the least squares fit through points.
• logarithmic = 2
Uses the equation y = c ln x + b to calculate the least squares fit through points.
• movingAverage = 3
Uses a sequence of averages computed from parts of the data series. The number of points equals the total number of points in the series less the number specified for the period.
• polynomial = 4
Uses an equation to calculate the least squares fit through points.
• power = 5
Uses an equation to calculate the least squares fit through points.