I like the P/BK method of quickly valuing shares of stock. It is much less subject to manipulation than the more popular price to earnings ratio. And it does not suffer the too common fate of stock dividend methods of evaluating a share's worth, that the dividend can be cut or eliminated just a little after its relative generosity has made the stock seem so tempting a buy.
Even if one does not restrict more than a portion of one's overall stock holdings (25%, for instance) to low price to book assets, a reduction in the average portfolio price to book value will tend to decrease the risk of nest egg loss and to increase the potential for superior total returns.
Since some investment strategies definitely do not lend themselves to a low price to book value approach, one might balance other methods with this technique for a significant fraction of the total assets and so gain some benefit.
A portfolio of the lowest P/BK stocks tends, not surprisingly, to be more profitable, averaging in the past, about 15% per year, compared with 10-11% for the stock market as a whole.