In the previous two parts of this series, we looked at aspects like
In this part we will explore the idea of leading vs. lagging – the concept of leading vs. lagging can get confusing if you compare it with the previous post on “predictive value” of Indicators.
I look at it this way – Any indicator that uses “Price” or “Volume” as the input is lagging, simply because a given price point does not cause another price point and a given level of volume does not cause another level of volume.
That is the single biggest reason indicators like Moving Averages or Volume Underlays look so elegant in retrospect but are not tradable as such.
For something to be categorized as “Leading” – We would need to look behind the “veil” of price and volume. Market microstructure aspects like (Simple - 'Executed Order Info.') Bid-Ask Spread, Delta Divergence, Executed Trade Rate - and more (Complex - 'State of LOB Info.') Limit Order Book (LOB) Slope, Relative Depth of the LOB, LOB Volume/Order Arrival Rate etc. are the factors that “lead” to the midpoint of the spread a.k.a “Price”.
Again, one has to understand that irrespective of whether the input for the indicator is Leading or Lagging, one has to do backtests to check for validity, and predictive effectiveness.
That brings me to the end of this 3 part series. In the coming posts, I will explore some such (Simple) Indicators and see how they work for NIFTY.