The CBOE put/call ratio -
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The Chicago Board Options Exchange (CBOE) put/call ratio is used by contrary-opinion technical analysts. A higher ratio of puts to calls indicates a bearish market sentiment, while a lower ratio indicates the opposite. Contrary-opinion analysts believe that the sentiment is wrong, and assume ahigher ratio value is bullish while a low value is bearish. Currently, ratio values of 0.70 or less are viewed bearishly, while ratio values of 0.90 or greater are viewed bullishly.