Sample Size for Selecting Most Reliable of K Normal (Lognormal) Populations

An experimenter wishes to select the most reliable of K s-normal (or lognormal) populations. If he samples n items from each of the K populations, then how large should n be in order that he will have a desired level for the probability of correct selection? This paper gives tables which answer this sample-size question.     

Neuropsychological and EEG disturbances in polydrug users

EEG and neuropsychological evaluation of 66 polydrug users revealed that 43% had EEG abnormalities and 45% had neuropsychological impairment 3 weeks after admission to a polydrug study unit. At 5-month follow-up, 27% of 30 retested subjects were still impaired neuropsychologically. Impairment may be related to extensive involvement with sedatives, alcohol, or heavy polydrug use. The authors suggest that cerebral dysfunction in polydrug users might be the result of organicity of intermediate duration and that deficits may be experienced by some beyond 5 months of reduced use or abstinence. Organicity may dictate structured, reality-based intervention techniques, especially early in treatment.     

Transitions in children's understanding of parental roles.

In 2 studies, 64 3–7? yr old White children were tested for a predicted, 6-step sequence of parental role concepts. Dolls were used to represent typical family roles, about which questions concerning role explanations were asked of Ss. The sequence was found to be scalable. Between 3 and 4? yrs of age, Ss could describe a parental role in terms of several behaviors appropriate to the role. By 6 yrs of age, most Ss could understand a parental role in terms of its relation to a complementary role. By 7 yrs of age, most Ss could describe and explain how 2 family role relationships could occur simultaneously for the same person. Implications of this sequence are discussed in terms of the generalization from previous studies and the explanatory power of the sequence. (15 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Comparison of several procedures for generating J-coefficients.

J-coefficients were examined as estimators of criterion-related validities for the occupation of machinist in a medium-sized international manufacturer of precision automotive accessories. Test and job performance components of the J-coefficient were estimated from supervisory, incumbent, coworker, policy capturing, importance, and test expert ratings. The results indicated that combinations of estimates from several sources generated J-coefficients that reproduced the pattern and mean values of the validities. Supervisory and incumbent sources were superior to test expert source for estimating test components, whereas co-worker, policy capturing, and importance sources were equally effective for estimating job performance components. The implications of the J-coefficient are discussed for personnel selection. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The Application of Reduced-Wattage Fluorescent Lamps and High-Efficiency Ballasts to General Lighting Systems

The introduction of new energy-saving lamps and ballasts for fluorescent lighting has focused attention on the electrical and performance characteristics of the lamp/ballast/luminaire system. To obtain optimum efficiency the lighting designer must now consider not only catalog and nameplate ratings, but also hard-to-obtain thermal and field factors which can substantially affect energy input and light output values. A discussion of these factors is presented along with practical design information for a number of lamp/ballast combinations are used in a variety of standard luminaires. Also included is the expected impact on system energy use and economics.     

Focal issues for institutional change.

Six focal issues related to innovation and change in people-changing institutions are illustrated by examples from a total-change project at an institution for adjudicated delinquent male adolescents. These issues reflect the following needs: (a) adoption of a guiding philosopy of rehabilitation, treatment, and/or education that adequately considers the ecological context in which the philosophy must operate; (b) use of historical context (perspective) to aid understanding and action; (c) attention to the staff of people-changing institutions; (d) development of an organizational structure that can best foster a growth-producing environment for both staff and residents; (e) acknowledgement of problems of innovation and implementation; and (f) external orientation and community focus. (75 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

ORGANIZATIONAL SLACK IN MUNICIPAL GOVERNMENTS: A COST VARIANCE ANALYSIS

Stack is a central theoretical concept for which we suggest original measurement procedures. Cost variance analysis is used to measure labor organizational slack (LOS) in a national sample of American municipal governments. National norms serve as standards. Positive slack occurs when actual costs exceed standard costs. Some cities experienced positive slack, others negative slack. Staffing and Compensation Indices are estimated and found to be negatively correlated. Implications for public policy and further research are discussed. When you can measure what you are speaking about, and express it in numbers, you know something about it; when you cannot express it in numbers, your knowledge is of a meager and unsatisfactory kind.     

A Measurement of the Energy Resolution and Related Properties of an SCG1-C Scintillation Glass Shower Counter Array for 1-25 GeV Positrons

We report the measurement of the energy resolution of a 4×4 array of SCG1-C scintillation glass counters (Ohara Optical Glass Manufacturing Co., Ltd.) exposed to positrons in the energy range of 1 to 25 GeV. Each element of the array was 20.5 radiation lengths long. The resolution of the array was measured both with and without a 3.5 radiation length SCG1-C scintillation glass active converter and 0.2 radiation length hodoscopes used to measure shower position. We obtained an energy resolution ?/E = (1.63 + 1.46/?E)% without the active converter and ?/E = (0.64 + 3.94/?E)% with the active converter. Performing a partial correction for the average energy loss in the 0.2 radiation length hodoscopes resulted in an energy resolution of ?/E = (0.50 + 3.43/?/E)% for the active converter measurement. We also report on the measurement of the absolute number of photons produced by 1 GeV showers, the optical attenuation length for the light produced by showers, the fraction of the total light output that is due to Cerenkov light relative to scintillation light for showers, and the radiation darkening sensitivity of the scintillation glass.     

Data-base management systems—Data models and query languages

Data-base management systems support three types of data model—hierarchic, network, and relational. Query facilities range from high-level, nonprocedural languages to host-language, coded procedures. Evaluation of DBMS for geoscience applications requires careful consideration of both these features.