MetlodsThese data were collected as part of a larger study of health risk behaviors of North Carolina public school students.4The Youth Risk Behavior Survey (YRBS)5 was administered during May 1990 to students in 9th-and 12th-grade classes that had been randomly selected using a self-weighting two-stage cluster sampling procedure. The survey instrument consisted of 61 forced-choice items, 4 of which addressed demographic questions; the remaining 57 items dealt with student behavior related to (1) violence; (2) tobacco, alcohol, and drug use; (3) exercise; (4) nutrition; and (5)

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Setting standards for medically based running analyses is necessary to ensure that runners receive a high-quality service from practitioners. Medical and training history, physical and functional tests, and motion analysis of running at self-selected and faster speeds are key features of a comprehensive analysis. Self-reported history and movement symmetry are critical factors that require follow-up therapy or long-term management. Pain or injury is typically the result of a functional deficit above or below the site along the kinematic chain.

This paper applies the exponential distribution to stock price reactions to determine, at three confidence levels, the critical percentage price reaction beyond which a reaction constitutes a strong likelihood of a major reversal or halt in the stock's present general price trend. We show that these critical values can be used to determine stop losses, so that a trader's position is closed when the probability of a major reversal or halt against his position is large, and an open position is kept open when the probability that the reaction is a major one is small or moderate. The distribution fit on ten stocks on daily and weekly bases for over a year's duration each, tested using the chi-squared statistic, was found to be good. Further, three stops, corresponding to three confidence levels of the distribution were tested for each stock against a subsequent six-month period of price action. The percentage of successful tests of these stops for each of the stocks corresponded very closely to expected results ascertained by using data from the previous period.

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