Share Price, PER

[allyhirama]

Hi,

I need to calculate the share price of a firm with limited information -- no PER, EPS. I have the PER and EPS for some firms in the same industry. To calculate the PER for my firm, I was going to calculate the average in the industry, however, one of the firms PER is significantly high and decreases significantly in the years after. Am I able to calculate the average PER of firms from different years? (I've been given forecasted and historial data for the other firms).

Many thanks!