Premier had its Relative Strength (RS) Rating upgraded from 68 to 74 Monday -- a welcome improvement, but still short of the 80 or higher score you prefer to see.

When looking for the best stocks to buy and watch, one factor to watch closely is relative price strength.

This exclusive rating from Investor's Business Daily tracks market leadership with a 1 (worst) to 99 (best) score. The grade shows how a stock's price behavior over the last 52 weeks compares to all the other stocks in our database.

Decades of market research shows that the stocks that go on to make the biggest gains typically have an 80 or better RS Rating in the early stages of their moves. See if Premier can continue to rebound and clear that threshold.

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Premier is now considered extended and out of buy range after clearing a 36.25 buy point in a first-stage flat base. See if the stock forms a new chart pattern or follow-on buying opportunity like a three-weeks tight or pullback to the 50-day or 10-week moving average.

The company showed 3% earnings growth in its most recent report, while sales growth came in at 40%.

Premier earns the No. 4 rank among its peers in the Commercial Services-Healthcare industry group. Vocera Communications and Modivcare Inc are also among the group's highest-rated stocks.