XLK daily version #2 showing the XLK:SPY ratio displayed at the bottom of this chart provides the evidence which Art Hill discusses in his March 3rd blog post at SC that:
XLK is the strongest of the 11 sector Spyders, and since it is the largest percentage contribution to the daily SPY and SPX price action, is an extremely important vigilance watch for traders
note: the XLK to SPY ratio rests in late February and early March 2018 at new record highs, since the "bubble" decline slide days of 1999 to 2003
chart #1 -
chart #2 - 20 year history for the XLK:SPY ratio's daily closes
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