The proven Zacks Rank system focuses on earnings estimates and estimate revisions to find winning stocks. Nevertheless, we know that our readers all have their own perspectives, so we are always looking at the latest trends in value, growth, and momentum to find strong picks.

Of these, perhaps no stock market trend is more popular than value investing, which is a strategy that has proven to be successful in all sorts of market environments. Value investors use a variety of methods, including tried-and-true valuation metrics, to find these stocks.

Zacks has developed the innovative Style Scores system to highlight stocks with specific traits. For example, value investors will be interested in stocks with great grades in the "Value" category. When paired with a high Zacks Rank, "A" grades in the Value category are among the strongest value stocks on the market today.

One company to watch right now is Perdoceo Education (PRDO Quick QuotePRDO - Free Report) . PRDO is currently holding a Zacks Rank of #2 (Buy) and a Value grade of A. The stock is trading with P/E ratio of 12.46 right now. For comparison, its industry sports an average P/E of 16. Over the last 12 months, PRDO's Forward P/E has been as high as 12.46 and as low as 8.41, with a median of 10.29.

Another valuation metric that we should highlight is PRDO's P/B ratio of 2.08. The P/B ratio is used to compare a stock's market value with its book value, which is defined as total assets minus total liabilities. This stock's P/B looks solid versus its industry's average P/B of 3.51. Within the past 52 weeks, PRDO's P/B has been as high as 2.08 and as low as 1.39, with a median of 1.73.

These figures are just a handful of the metrics value investors tend to look at, but they help show that Perdoceo Education is likely being undervalued right now. Considering this, as well as the strength of its earnings outlook, PRDO feels like a great value stock at the moment.