SPY indicator: The Spy-Dow premium

FX:SPX500   S&P 500 index of US listed shares
167 0 4
Motivation: Historical data shows how the index ratio SPY/DIA gives insight into different market phases since the Dow is more attractive when risk is high. (ref: )

Daily and intraday movements can be both described and predicted using trendlines on the SPX500             premium over the US30             in dollar terms. Specifically, the expression:

_SPX500*50 - _US30 *5 ($50 and $5 are the multipliers for SPY             and DOW futures respectively)
(Remove the underscores but KEEP the minus sign)

How to use:
1) The spikes coinside with SPX500             tops and bottoms.
2) the spikes tend to form well behaived trendlines and curves (relative to the index itself).
3) In shorter timeframes (5min or less) changes in the indicator coinside with significant changes in SPX500             AND are easier to discriminate from background noise.

Make your own:
Type:_SPX500*50 - _US30 *5
(Remove the underscores but KEEP the minus sign)
into a blank chart. Use lines for the style.
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