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Posts with the tag « research » :

🔗 A Cost Effective Reference Data Sampling Algorithm Using Fractal Analysis

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A random sampling or systematic sampling method is commonly used to assess the accuracy of classification results...So, a more effective sampling method that can represent the characteristics of the population is required. In this study, fractal analysis is adopted as an index for reference sampling. The fractal dimensions of the whole study area and the sub-regions are calculated to select sub-regions that have the most similar dimensionality to that of the whole area. Then the whole area's classification accuracy is compared with those of sub-regions, and it is verified that the accuracies of selected sub-regions are similar to that of whole area. A new kind of reference sampling method using the above procedure is proposed. The results show that it is possible to reduce sampling area and …

🔗 Zarrintan, S "Ejaculation as a potential treatment of nasal congestion in mature males" The Journal of Medical Hypotheses, 71(2), 2008.

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So the author proposes a more...natural method of decongestion. "It is known that sexual arousal in men is followed by penile erection and subsequent ejaculation" (unless of course you've taken too much Viagra or something). The emission phase of ejaculation is under the control of the sympathetic nervous system, which of course has lots of adrenergic receptors. The author reasons that ejaculation will stimulation adrenergic receptors in the refractory period immediately afterward, and stimulation of your adrenergic receptors will give you relief from your cold.

🔗 Assessing reliability and validity of the Arabic language version of the Post-traumatic Diagnostic Scale (PDS) symptom items.

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The PDS is a 49-item self-report measure recommended for use in clinical or research settings to measure severity of PTSD symptoms related to a single identified traumatic event. The PDS is unique in that it assesses all of the DSM-IV criteria for PTSD (i.e., Criteria A – F) and inquires about the past month (time frame can be adjusted for different uses). Thus, in addition to measuring the severity of PTSD symptoms (Criteria B, C, & D), it also inquires about the experience of a Criterion A traumatic events, about duration of symptoms (Criterion E), and the effects of symptoms on daily functioning (Criterion F).

🔗 Survey Sampling Methods

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The advantage of probability sampling is that sampling error can be calculated. Sampling error is the degree to which a sample might differ from the population. When inferring to the population, results are reported plus or minus the sampling error. In nonprobability sampling, the degree to which the sample differs from the population remains unknown.