Negative Directional Indicator for ADX

Measure negative downward movement.

Syntax: NDI(Length, Smoothing, Interval, [Ref], [Symbol])

Length = Required. 

Smoothing = Required. 

Interval = Required. 

[Ref] = Optional.

[Symbol] = Optional.

Comments: 

The default value in RavenQuote: Length = 14, Smoothing = 14.

Examples:

NDI(14, 14, 5, 0, YHOO)

Negative Directional Indicator for YHOO for the current 5-Minute Bar where the Length = 14 and the Smoothing = 14.