The purpose of this paper is to broaden the knowledge of mean difference and,<span><span><span style="font-family:;" "=""> </span></span></span><span sty...The purpose of this paper is to broaden the knowledge of mean difference and,<span><span><span style="font-family:;" "=""> </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">in particular, of an important distribution model known as Tukey lambda, which is generally used to choose a model to fit data.</span></span></span><span><span><span style="font-family:;" "=""> </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">We have obtained compact formulas, which are not yet reported in literature, of mean deviation and mean difference related to the said distribution model.</span></span></span><span><span><span style="font-family:;" "=""> </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">These results made it possible to analyze the relationships among variability indexes, namely standard deviation, mean deviation and mean difference, regarding Tukey lambda model.</span></span></span>展开更多
The Dagum model is particularly suitable for the analysis of the distributions of economic quantities, such as income, assets and consumption. The purpose of this note is to derive the expression of the mean deviation...The Dagum model is particularly suitable for the analysis of the distributions of economic quantities, such as income, assets and consumption. The purpose of this note is to derive the expression of the mean deviation from the median of the Dagum distribution to study the behavior of the scale and shape parameters in terms of absolute variability and in terms of relative variability.展开更多
AIM:To assess patients' visual performance with glistenings in one piece soft hydrophobic acrylic intraocular lenses(IOLs)(Alcon)2y postoperatively.METHODS:This cross section trial included 120 eyes with one piece...AIM:To assess patients' visual performance with glistenings in one piece soft hydrophobic acrylic intraocular lenses(IOLs)(Alcon)2y postoperatively.METHODS:This cross section trial included 120 eyes with one piece IOL at 2y postoperatively.Glistening was classified in 4 groups,ranging from 0(none)to 3(most evident)according to their severity in IOLs optics observed under a slit lamp.All eyes underwent a uncorrected and best-corrected visual acuity evaluation(UCVA and BCVA,LogMAR scale),a complete clinical examination,a contrast sensitivity(CS)evaluation by F.A.C.T chart,and a visual field test by Humphrey Field AnalyzerⅡ(HFA).One-way ANOVA was used for quantitative data,while Pearsonχ2test was used for qualitative data to analyze the visual function of 4glistening groups.RESULTS:Totally 120 eyes were enrolled with 30 eyes in each glistening group.There was no statistical correlation between glistening grades and patients'age,IOLs power,postoperative UCVA and BCVA(P>0.05).Quantificationally,CS values among each group were not statistically different.However,qualitative analysis showed there were more eyes in grade 3 group than in grade 0 group having abnormally declined CS at high spatial frequency(10%vs 36.7%at 18 cpd,P=0.029;6.7%vs 26.7%at 12 cpd,P=0.013).Mean deviation(MD)of the visual field test was-2.14±2.31,-1.97±2.23,-3.02±3.17,-4.12±3.38 in group 0 to 3 respectively.There was a significant decrease in the most serious glistenings group(P=0.018).CONCLUSION:Glistenings may potentially have an impact on contrast sensitivity at high spatial frequency and MD in visual field test.展开更多
This article develops a beta-exponentiated Ishita distribution that extends the exponentiated Ishita distribution. Expansions for the cumulative distribution and probability density functions are given. Various proper...This article develops a beta-exponentiated Ishita distribution that extends the exponentiated Ishita distribution. Expansions for the cumulative distribution and probability density functions are given. Various properties of the new distribution such as hazard function, moments, cumulants, skewness, kurtosis, mean deviations, Bonferroni and Lorenz curves, Rényi and Tsallis entropies, and stress-strength reliability are discussed. Moment generating function and characteristic function of the new model were derived. Distribution and the moment of order statistic have been derived. The method of maximum likelihood was used for estimation of parameters. The new model is quite flexible in analysing positively skewed data. Two real datasets are used to demonstrate the flexibility of the new distribution.展开更多
Water security is a widely concerned issue in the world nowadays.A new method,water poverty index(WPI),was applied to evaluate the regional water security.Twelve state farms in Heilongjiang Province,Northeastern China...Water security is a widely concerned issue in the world nowadays.A new method,water poverty index(WPI),was applied to evaluate the regional water security.Twelve state farms in Heilongjiang Province,Northeastern China were selected to evaluate water security status based on the data of 2006 using WPI and mean deviation grading method.The method of WPI includes five key indices:resources(R),access(A),capacity(C),utilization(U)and environment(E).Each key index further consists of several sub-indices.According to the results of WPI,the grade of each farm was calculated by using the method of mean deviation grading.Thus,the radar images can be protracted of each farm.From the radar images,the conclusions can be drawn that the WPI values of Farm 853 and Hongqiling are under very safe status,while that of Farm Raohe is under safe status,those of Farms Youyi,597,852,291 and Jiangchuan are under moderate safe status,that of Farm Beixing is under low safe status and those of Farm Shuangyashan,Shuguang and Baoshan are under unsafe status.The results from this study can provide basic information for decision making on rational utilization of water resources and regulations for regional water safety guarantee system.展开更多
文摘The purpose of this paper is to broaden the knowledge of mean difference and,<span><span><span style="font-family:;" "=""> </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">in particular, of an important distribution model known as Tukey lambda, which is generally used to choose a model to fit data.</span></span></span><span><span><span style="font-family:;" "=""> </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">We have obtained compact formulas, which are not yet reported in literature, of mean deviation and mean difference related to the said distribution model.</span></span></span><span><span><span style="font-family:;" "=""> </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">These results made it possible to analyze the relationships among variability indexes, namely standard deviation, mean deviation and mean difference, regarding Tukey lambda model.</span></span></span>
文摘The Dagum model is particularly suitable for the analysis of the distributions of economic quantities, such as income, assets and consumption. The purpose of this note is to derive the expression of the mean deviation from the median of the Dagum distribution to study the behavior of the scale and shape parameters in terms of absolute variability and in terms of relative variability.
基金Supported by the Science and Technology Planof Guangdong Province,Guangzhou,China(No.2006B36006005)
文摘AIM:To assess patients' visual performance with glistenings in one piece soft hydrophobic acrylic intraocular lenses(IOLs)(Alcon)2y postoperatively.METHODS:This cross section trial included 120 eyes with one piece IOL at 2y postoperatively.Glistening was classified in 4 groups,ranging from 0(none)to 3(most evident)according to their severity in IOLs optics observed under a slit lamp.All eyes underwent a uncorrected and best-corrected visual acuity evaluation(UCVA and BCVA,LogMAR scale),a complete clinical examination,a contrast sensitivity(CS)evaluation by F.A.C.T chart,and a visual field test by Humphrey Field AnalyzerⅡ(HFA).One-way ANOVA was used for quantitative data,while Pearsonχ2test was used for qualitative data to analyze the visual function of 4glistening groups.RESULTS:Totally 120 eyes were enrolled with 30 eyes in each glistening group.There was no statistical correlation between glistening grades and patients'age,IOLs power,postoperative UCVA and BCVA(P>0.05).Quantificationally,CS values among each group were not statistically different.However,qualitative analysis showed there were more eyes in grade 3 group than in grade 0 group having abnormally declined CS at high spatial frequency(10%vs 36.7%at 18 cpd,P=0.029;6.7%vs 26.7%at 12 cpd,P=0.013).Mean deviation(MD)of the visual field test was-2.14±2.31,-1.97±2.23,-3.02±3.17,-4.12±3.38 in group 0 to 3 respectively.There was a significant decrease in the most serious glistenings group(P=0.018).CONCLUSION:Glistenings may potentially have an impact on contrast sensitivity at high spatial frequency and MD in visual field test.
文摘This article develops a beta-exponentiated Ishita distribution that extends the exponentiated Ishita distribution. Expansions for the cumulative distribution and probability density functions are given. Various properties of the new distribution such as hazard function, moments, cumulants, skewness, kurtosis, mean deviations, Bonferroni and Lorenz curves, Rényi and Tsallis entropies, and stress-strength reliability are discussed. Moment generating function and characteristic function of the new model were derived. Distribution and the moment of order statistic have been derived. The method of maximum likelihood was used for estimation of parameters. The new model is quite flexible in analysing positively skewed data. Two real datasets are used to demonstrate the flexibility of the new distribution.
基金National Natural Science Foundation of China(No.30400275)Science&Technology Tackle Key Problem Program of Heilongjiang Province(No.GB06B106-7).
文摘Water security is a widely concerned issue in the world nowadays.A new method,water poverty index(WPI),was applied to evaluate the regional water security.Twelve state farms in Heilongjiang Province,Northeastern China were selected to evaluate water security status based on the data of 2006 using WPI and mean deviation grading method.The method of WPI includes five key indices:resources(R),access(A),capacity(C),utilization(U)and environment(E).Each key index further consists of several sub-indices.According to the results of WPI,the grade of each farm was calculated by using the method of mean deviation grading.Thus,the radar images can be protracted of each farm.From the radar images,the conclusions can be drawn that the WPI values of Farm 853 and Hongqiling are under very safe status,while that of Farm Raohe is under safe status,those of Farms Youyi,597,852,291 and Jiangchuan are under moderate safe status,that of Farm Beixing is under low safe status and those of Farm Shuangyashan,Shuguang and Baoshan are under unsafe status.The results from this study can provide basic information for decision making on rational utilization of water resources and regulations for regional water safety guarantee system.