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Assessment of imaging diagnosis ability of skin tumors in Chinese dermatologists

Chinese Medical Journal 2019年第17期132卷 2119-2120页

作者： Chang-Bing Shen Xue Shen Cheng-Xu Li Ru-Song Meng Yong Cui Department of Dermatology China-Japan Friendship Hospital Beijing 100029 China Graduate School Peking Union Medical College and Chinese Academy of Medical Sciences Beijing 100730 China Hinda and Arthur Marcus Institute for Aging Research Hebrew SeniorLife and Harvard Medical School Boston MA 02131 USA Department of Dermatology The First Affiliated Hospital Anhui Medical University Hefei 230032 Anhui China Department of Dermatology Specialty Medical Center of the Air Force People’s Liberation Army Beijing 100142 China

Skin tumors begin from normal skin cells, and some parts of them may transform with the potential to reproduce in an out-of-control manner.[1] Skin tumors are exceedingly common and the incidence is increasing at an a... 详细信息

关键词： out-of-control globe alarming

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Analysis of the Effect of Subgroup Size on the X-Bar control Chart Using Forensic Science Laboratory Sample Influx Data

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Engineering（科研） 2017年第5期9卷 434-456页

作者： Samwel Victor Manyele Department of Forensic Science and DNA Services Government Chemist Laboratory Authority (GCLA) Dar es Salaam Tanzania

This paper analyzes the effect of subgroup size on the x-bar chart characteristics using sample influx (SIF) into forensic science laboratory (FSL). The characteristics studied include changes in out-or-control points (OCP), upper control limit UCLx, and zonal demarcations. Multi-rules were used to identify the number of out-of-control-points, Nocp as violations using five control chart rules applied separately. A sensitivity analysis on the Nocp was applied for subgroup size, k, and number of sigma above the mean value to determine the upper control limit, UCLx. A computer code was implemented using a FORTRAN code to create x-bar control-charts and capture OCP and other control-chart characteristics with increasing k from 2 to 25. For each value of k, a complete series of average values, Q(p), of specific length, Nsg, was created from which statistical analysis was conducted and compared to the original SIF data, S(t). The variation of number of out-of-control points or violations, Nocp, for different control-charts rules with increasing k was determined to follow a decaying exponential function, Nocp = Ae–α, for which, the goodness of fit was established, and the R2 value approached unity for Rule #4 and #5 only. The goodness of fit was established to be the new criteria for rational subgroup-size range, for Rules #5 and #4 only, which involve a count of 6 consecutive points decreasing and 8 consecutive points above the selected control limit (σ/3 above the grand mean), respectively. Using this criterion, the rational subgroup range was established to be 4 ≤ k ≤ 20 for the two x-bar control chart rules.

关键词： Forensic Science Laboratory Sample Influx Statistical Analysis X-bar control Chart Sub-Group Size control Chart Rules Multi-Rules for X-Bar Chart out-of-control Points

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