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Reported single car and truck accidents due specifically to driver 'fatigue' for the 4-year span of 1980-1983 were analyzed for 24-hr, 7-d and 1-yr patterns. Three types of data were examined: (1) accidents in rural Texas, (2) accidents only in San Antonio, the fourth largest city in Texas and (3) accident ratio (number of accidents per time interval divided by traffic volume for the interval) in this city. A statistically significant seasonal variation of relatively low amplitude with peaks in May and July was detected only for accidents in rural areas. High-amplitude periodicities of 7 d were evident in all the data sets, with a peak on the weekend. A very prominent 24-hr pattern was detected as well, with the acrophase determined by single cosinor around 0300. A slight secondary peak in accidents, around 1500, was evident in the data from the rural areas. This secondary peak represented a 12-hr rhythm in addition to the 24-hr. Overall, features of the temporal patterns in accidents over 24 hr and over the year in urban and rural areas differed only slightly. Accident ratios yielded results similar to accident frequencies. However, with regard to the rural data, the shape of the 24-hr temporal pattern varied with driver age; older drivers exhibited a flatter curve with a more pronounced afternoon rather than early morning (around 0300) peak.

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Summary Probability models on games involving two opposing players or teams are discussed with particular emphasis on the relative probability of a server in a play. Two examples (i.e. the tennis and badminton games) are presented. Several comments and suggestions are made regarding their game rules.

This study presents information on 30 couples involved in marital violence within a sample of 60 couples who were seeking psychiatric assistance for marital conflict. Both univariate and multivariate analyses were used in data analysis. Key variables identifying battered wives were frequent alcohol use by their husbands, frequent marital arguments, a low educational level, and frequent legal drug use. Abusing husbands were characterized by backgrounds of family violence, frequent alcohol use, a low education level, and frequent marital arguments.

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