Overvalued /Undervalued share.........

#1
How can we judge......that if share 'xyz' is trading at 100 is undervalued/overvalued.What is the process used to evaluate the current market price of a stock by trade analyst. This will help me in entering at best possible price into the stock for for tenure(1+ year).

Few days back reliance industries was trading at 2100+ level and one of trade analyst pointed out that currently it is overvalued stock at this price and it will come down to 1800 levels soon.
 

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