how to find market top or bottom coming?

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http://www.amateur-investor.net/Put%20to%20Call%20ratio.htm

The Put to Call ratio measures the amount of volume in Puts versus Calls. When Put volume becomes excessive in relation to Call volume, it's an indication of excessive bearishness in the market (a bullish sign).

Conversely if Call volume becomes excessive to Put volume, it's a sign of excessive bullishness in the market (a bearish sign). A chart of the Put to Call Ratio versus the S&P 500 is shown below.

Notice when the Put to Call Ratio has risen significantly above "1.0" this has generally led to a market bottom followed by a significant upside reversal. Some examples include the Fall of 2001 (point A), Spring of 2001 (point B), Fall of 1999 (point C) and back in the Fall of 1998 (point D). However more recently the Put to Call Ratio hasn't worked as well as their have been some false signals in which the Put to Call Ratio rose well above "1.0" but wasn't accompanied by a strong upside reversal (points E, F and G).


In addition to signaling a potential short term bottom in the markets, the Put to Call Ratio may also signal an impending market top as well.

The most recent one occurred in early July (Point A) when the Put to Call Ratio got close to 0.4 and was followed by a market correction a few days later. Other corrections occurred in mid-July of 1998, late September of 1998 and early December of 1998 as the Put to Call Ratio quickly reversed to the downside.