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Question |
I'm seeing discrepancies between my indicator values in
a Custom Column (Scan, Signal, or Backtest) versus the values I see in
my chart (or in another program). What might account for this? |
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Answer |
I suspect that these indicators may be "cumulative"
indicators. A cumulative indicator us one that builds upon itself
(it's own previous value). Any indicator involving an exponential
smoothing fits into this "cumulative" category.. When an indicator is
cumulative, its value is dependant in some respect on all previous data
elements that are considered/loaded for the calculation. While the chart
is loading a certain number of bars (depending on the charts viewing
period), the custom column is loading a minimal number of bars for
efficiency purposes. Who's to say exactly which value is correct, but in
my opinion, the chart would be more reliable because it's probably
considering/loading more historical data in its calculations. How can
you make the chart match the custom column? One way is to use a custom
indicator setup with "Bars: All Data". That will force the custom column
to calculate using all the data for the given periodicity that is
available (as opposed the minimum efficient number of bars that I/RT
determines it needs). This method is not as efficient, but more
accurate. |
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