Theory Of Probabilities
Mostrando 37-45 de 45 artigos, teses e dissertações.
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37. Rapid identification of Enterobacteriaceae with microbial enzyme activity profiles.
A total of 539 clinical isolates belonging to 10 species of the Enterobacteriaceae family were identified by enzyme activity profiles within 30 min of test inoculation. Each isolate was grown at 37 degrees C for 18 h on Mueller-Hinton agar and suspended to an optical density of 200 Klett units on 0.85% saline. Enzyme activity profiles were obtained by inocul
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38. On a psychophysical transformed-rule up and down method converging on a 75% level of correct responses
Tranformed-rule up and down psychophysical methods have gained great popularity, mainly because they combine criterion-free responses with an adaptive procedure allowing rapid determination of an average stimulus threshold at various criterion levels of correct responses. The statistical theory underlying the methods now in routine use is based on sets
The National Academy of Sciences.
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39. To catheterise or not to catheterise? An approach based on decision theory.
To determine whether or not patients require cardiac catheterisation before surgery a computer based mathematical model was constructed based on decision theory. The model was specifically applied to sick infants under 3 months of age with suspected coarctation of the aorta, and a three way sensitivity analysis was carried out to assess the effects on the mo
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40. The dynamics of mass migration
We specify a set of equations defining a dynamic model of international migration and estimate its parameters by using data specially collected in Mexico. We then used it to project the a hypothetical Mexican community population forward in time. Beginning with a stable population of 10,000 people, we project ahead 50 years under three different assumptions:
The National Academy of Sciences.
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41. On the Theory of Partially Inbreeding Finite Populations. III. Fixation Probabilities under Partial Selfing When Heterozygotes Are Intermediate in Viability
In a previous paper by the senior author, an approximation to the probability of survival was given for a mutant, which is originally present in a single heterozygote, in a population that reproduces partly by selfing and partly by random mating. The population was assumed to be very large, but the result obtained is general with regard to the level of domin
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42. Comparative method for actuarial analysis of cardiac valve replacements.
The use of survival analysis in cardiac surgical reports has been widely accepted in order to characterise and compare performances of different valve prostheses. However, the analyses that have been described elsewhere may be improved in several respects. The original method proposed for prosthetic valve evalation examined follow-up related to patients rath
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43. Toward a theory for the evolution of cultural communication: coevolution of signal transmission and reception.
A haploid sexual two-locus model of gene-culture coevolution is examined, in which a dichotomous phenotype subject to natural selection is transmitted vertically with probabilities dependent on the chosen parent's genotype and phenotype and the offspring's genotype. Stability conditions for the genetically monomorphic corner equilibria are obtained. In a spe
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44. Training and search methods for speech recognition.
Speech recognition involves three processes: extraction of acoustic indices from the speech signal, estimation of the probability that the observed index string was caused by a hypothesized utterance segment, and determination of the recognized utterance via a search among hypothesized alternatives. This paper is not concerned with the first process. Estimat
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45. Why physicians choose different types of practice settings.
This paper presents an extension of Freidson's typology concerning the four medical practice settings which physicians may enter. First, Freidson's typology is modified to contain only three medical practice settings: 1) solo practices; 2) small group practices (partnerships or associations consisting of two to seven physicians); and, 3) large group practice