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{description}
{excerpt}For all trendline types except moving average, sets or returns the number of periods the regression should extrapolate backward.{excerpt}
{signature:C#}
 public double BackcastPeriods{ get; set; }

{signature}{signature:vb.net

}
Public Property BackcastPeriods() As Double

{signature}
{remarks}
Setting this value will cause the trendline to start before the beginning of the data.
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