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      <title>What is &apos;probability of backtest overfitting,&apos; and how is it actually measured?</title>
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      <pubDate>Sat, 15 Aug 2026 08:52:03 GMT</pubDate>
      <dc:creator>Naomi Bergman</dc:creator>
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      <title>Anatomy of a bid-ask spread: where the pennies go</title>
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      <pubDate>Thu, 23 Jul 2026 12:00:00 GMT</pubDate>
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      <title>What does trading volume measure, and what doesn&apos;t it tell you?</title>
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      <pubDate>Tue, 30 Jun 2026 12:00:00 GMT</pubDate>
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      <title>What does after-hours trading actually cost?</title>
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      <description><![CDATA[What after-hours trading actually costs: ECN sessions, multi-x spreads, thin depth, the April 2025 episodes, and how to benchmark extended-hours fills.]]></description>
      <pubDate>Sun, 07 Jun 2026 12:00:00 GMT</pubDate>
      <dc:creator>Naomi Bergman</dc:creator>
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      <title>What actually happens to a stock when its index adds it?</title>
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      <description><![CDATA[What measurably happens when a stock joins the S&P 500: announcement pops, effective-date auction flow, partial reversal — by window.]]></description>
      <pubDate>Sat, 16 May 2026 12:00:00 GMT</pubDate>
      <dc:creator>Naomi Bergman</dc:creator>
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      <title>What does dealer gamma exposure measure, and what doesn&apos;t it?</title>
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      <description><![CDATA[What dealer gamma exposure (GEX) measures, how the aggregate is built on inferred positions, and the four ways the headline number fails.]]></description>
      <pubDate>Thu, 23 Apr 2026 12:00:00 GMT</pubDate>
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      <title>Your rolling correlation depends on the window you chose</title>
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      <description><![CDATA[Rolling correlation depends on the window: how 60-day and 250-day estimates diverge, how to test window sensitivity, and what March 2020 showed.]]></description>
      <pubDate>Tue, 31 Mar 2026 12:00:00 GMT</pubDate>
      <dc:creator>Naomi Bergman</dc:creator>
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      <title>What does the VIX futures curve actually show?</title>
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      <description><![CDATA[What the VIX futures curve shows: contango, backwardation, roll costs and the spot-futures basis — and where reading the curve misleads.]]></description>
      <pubDate>Sun, 08 Mar 2026 12:00:00 GMT</pubDate>
      <dc:creator>Sofia Lindqvist</dc:creator>
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      <title>When do stock circuit breakers actually halt trading?</title>
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      <description><![CDATA[Circuit breakers explained: the 7, 13 and 20 percent S&P 500 thresholds, the 3:25 p.m. cutoff, what halts cover, and where the mechanism fails.]]></description>
      <pubDate>Sat, 14 Feb 2026 12:00:00 GMT</pubDate>
      <dc:creator>Naomi Bergman</dc:creator>
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      <title>How is market liquidity actually measured?</title>
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      <description><![CDATA[How market liquidity is measured: spreads, depth, Amihud illiquidity and Kyle lambda, and where every liquidity proxy fails. A methods explainer.]]></description>
      <pubDate>Thu, 22 Jan 2026 12:00:00 GMT</pubDate>
      <dc:creator>Naomi Bergman</dc:creator>
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      <title>Implied volatility is a price, realized volatility is a measurement</title>
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      <description><![CDATA[Implied vs realized volatility: one is a price, the other a measurement. How the variance risk premium is measured and where comparisons mislead.]]></description>
      <pubDate>Tue, 30 Dec 2025 12:00:00 GMT</pubDate>
      <dc:creator>Naomi Bergman</dc:creator>
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