To get information in the sexual and contraceptive behaviors in Chinese female college students, a randomized cluster sampling was conducted in colleges and universities in Wuhan Area, China, in terms of types of coll...To get information in the sexual and contraceptive behaviors in Chinese female college students, a randomized cluster sampling was conducted in colleges and universities in Wuhan Area, China, in terms of types of colleges, subjects (literature, sciences, medicines, art etc), and grades etc. A total number of 2450 questionnaires were distributed, with 2365 questionnaires returned being valid. The return rate of valid questionnaires was 96.6 %. The questionnaire investigation was conducted on a multiple-choice and anonymous basis. Data were input into computer and SPSS12.0 software package was employed for statistical analysis. Among the female students, 1196 had the experiences of hugging and kissing (50.57 %) and 423 (17.89 %) had sexual experiences (sexual intercourse). The first sexual intercourse took place at the age of 19.23±1.74 y. There were significant differences in the sexual experiences among the majors of different subjects, with the rate of sexual experiences in art majors (43.17 %) and high-grade students (34.31%) being the highest. The causes of the first sexual intercourse included sexual impulse, curiosity, intention to strengthen the relationship or to show loyalty to boyfriend and sometimes violence. While the motives of the sexual intercourse within the past one year before the investigation were to satisfy the sexual needs and to strengthen the relation with their boyfriends. With both first intercourse and sexual experiences within last one year, the partners of the sexual intercourse were mainly their boyfriends (95.7 % and 97.3 % respectively), but the partners also included acquaintances, "one night stand" partners and customers of sex trade. Some of them had multiple sexual partners, with the highest number of the sexual partners being 11. In the first sexual intercourse of the subjects, 44.0 % of them did not take any contraceptive measures; only 16.4 % of them used condoms. In the sexual intercourse within the last one year, only 44.6 % took contraceptive measures every time they had sexual intercourse. Among those who took contraceptive measures, 64.4 % used condoms. Among those who had sexual intercourse, 101 persons got pregnant, with a rate of pregnancy being 4.3 %, accounting for 23.9 % of all who had sexual intercourse. Among those who got pregnant, 78 persons got pregnant once; the others became pregnant more than two times, the highest being 5 times. There were 122 persons who had inflammation of reproductive system, mostly vaginitis. Other conditions included venereal warts and herpes genitalis. It is concluded that the rate of sexual behaviors is high in female college students and there exist promiscuity, unexpected pregnancy and transmission of STD in the students.展开更多
Objective To provide reference for the relevant departments to train and manage online drug sellers.Methods A questionnaire was conducted among 124 grass-roots drug sellers from 13 online drug sales enterprises,includ...Objective To provide reference for the relevant departments to train and manage online drug sellers.Methods A questionnaire was conducted among 124 grass-roots drug sellers from 13 online drug sales enterprises,including Tmall Medical Center and JD Home Health Channel and 265 teachers and students from 33 pharmaceutical colleges and universities.The problems were analyzed in this paper and some specific suggestions were made.Results and Conclusion 389 questionnaires were sent out and 371 effective questionnaires were recovered.The effective recovery rate was 95.37%.The universities surveyed mainly recruited undergraduates,accounting for 66.7%of the total.Most of the employees in the online drug sales enterprises surveyed graduated from secondary school or universities,accounting for 91.9%.The number of graduates surveyed who were willing to work in the online drug sales enterprises was low,accounting for only 8.67%.Besides,it was difficult for online drug sellers to be promoted,71.7%of the respondents had no promotion opportunities.In view of the main problems such as the low professional quality of online drug sellers,their low willingness to engage in online drug sales,and few promotion opportunities,it is suggested the reform of licensed pharmacists should be deepened to improve the number and quality of online drug sellers.Meanwhile,we should learn the advanced experience from developed countries.In addition,the income and welfare of the online drug sellers should be improved.Lastly,a unified management platform must be set up for online drug sellers by technical means.展开更多
The Current Population Survey(CPS)is a monthly household sample survey with a sample consisting of eight rotation groups.Sampled individuals of a rotation group are interviewed four consecutive months and another four...The Current Population Survey(CPS)is a monthly household sample survey with a sample consisting of eight rotation groups.Sampled individuals of a rotation group are interviewed four consecutive months and another four consecutive months after resting eight consecutive months.A composite-type estimator is adopted in the CPS for the estimation of the monthly population total,which combines sample information from the current month’s survey and previous months using the fact that 75%households have data for two consecutive months.There are two values,A and K,in the composite estimator to decide how to combine the available information,and thus this estimator is called the AK composite estimator.In this paper,we use a formula of the meansquared error of AK composite estimator and propose an easy-to-use method of choosing A and K based on data,which evolves the estimation of some population quantities using the method of moments and replication.Some numerical studies are conducted to illustrate the effectiveness of the proposed method.展开更多
A recent paper [Thibaudeau, Slud, and Gottschalck (2017). Modeling log-linear conditional probabilities for estimation in surveys. The Annals of Applied Statistics, 11, 680–697] proposed a ‘hybrid’method of survey ...A recent paper [Thibaudeau, Slud, and Gottschalck (2017). Modeling log-linear conditional probabilities for estimation in surveys. The Annals of Applied Statistics, 11, 680–697] proposed a ‘hybrid’method of survey estimation combining coarsely cross-classified design-based survey-weightedtotals in a population with loglinear or generalised-linear model-based conditional probabilitiesfor cells in a finer cross-classification. The models were compared in weighted and unweightedforms on data from the US Survey of Income and Program Participation (SIPP), a large nationallongitudinal survey. The hybrid method was elaborated in a book-chapter [Thibaudeau, Slud,& Cheng (2019). Small-area estimation of cross-classified gross flows using longitudinal survey data. In P. Lynn (Ed.), Methodology of longitudinal surveys II. Wiley] about estimating grossflows in (two-period) longitudinal surveys, by considering fixed versus mixed effect versionsof the conditional-probability models and allowing for 3 or more outcomes in the later-periodcategories used to define gross flows within generalised logistic regression models. The methodology provided for point and interval small-area estimation, specifically area-level two-periodlabour-status gross-flow estimation, illustrated on a US Current Population Survey (CPS) datasetof survey respondents in two successive months in 16 states. In the current paper, that data analysis is expanded in two ways: (i) by analysing the CPS dataset in greater detail, incorporatingmultiple random effects (slopes as well as intercepts), using predictive as well as likelihood metrics for model quality, and (ii) by showing how Bayesian computation (MCMC) provides insightsconcerning fixed- versus mixed-effect model predictions. The findings from fixed-effect analyseswith state effects, from corresponding models with state random effects, and fom Bayes analysisof posteriors for the fixed state-effects with other model coefficients fixed, all confirm each otherand support a model with normal random state effects, independent across states.展开更多
基金This project was supported by a grant from the National Population and Family Planning Commission of China (No. C1-56).
文摘To get information in the sexual and contraceptive behaviors in Chinese female college students, a randomized cluster sampling was conducted in colleges and universities in Wuhan Area, China, in terms of types of colleges, subjects (literature, sciences, medicines, art etc), and grades etc. A total number of 2450 questionnaires were distributed, with 2365 questionnaires returned being valid. The return rate of valid questionnaires was 96.6 %. The questionnaire investigation was conducted on a multiple-choice and anonymous basis. Data were input into computer and SPSS12.0 software package was employed for statistical analysis. Among the female students, 1196 had the experiences of hugging and kissing (50.57 %) and 423 (17.89 %) had sexual experiences (sexual intercourse). The first sexual intercourse took place at the age of 19.23±1.74 y. There were significant differences in the sexual experiences among the majors of different subjects, with the rate of sexual experiences in art majors (43.17 %) and high-grade students (34.31%) being the highest. The causes of the first sexual intercourse included sexual impulse, curiosity, intention to strengthen the relationship or to show loyalty to boyfriend and sometimes violence. While the motives of the sexual intercourse within the past one year before the investigation were to satisfy the sexual needs and to strengthen the relation with their boyfriends. With both first intercourse and sexual experiences within last one year, the partners of the sexual intercourse were mainly their boyfriends (95.7 % and 97.3 % respectively), but the partners also included acquaintances, "one night stand" partners and customers of sex trade. Some of them had multiple sexual partners, with the highest number of the sexual partners being 11. In the first sexual intercourse of the subjects, 44.0 % of them did not take any contraceptive measures; only 16.4 % of them used condoms. In the sexual intercourse within the last one year, only 44.6 % took contraceptive measures every time they had sexual intercourse. Among those who took contraceptive measures, 64.4 % used condoms. Among those who had sexual intercourse, 101 persons got pregnant, with a rate of pregnancy being 4.3 %, accounting for 23.9 % of all who had sexual intercourse. Among those who got pregnant, 78 persons got pregnant once; the others became pregnant more than two times, the highest being 5 times. There were 122 persons who had inflammation of reproductive system, mostly vaginitis. Other conditions included venereal warts and herpes genitalis. It is concluded that the rate of sexual behaviors is high in female college students and there exist promiscuity, unexpected pregnancy and transmission of STD in the students.
文摘Objective To provide reference for the relevant departments to train and manage online drug sellers.Methods A questionnaire was conducted among 124 grass-roots drug sellers from 13 online drug sales enterprises,including Tmall Medical Center and JD Home Health Channel and 265 teachers and students from 33 pharmaceutical colleges and universities.The problems were analyzed in this paper and some specific suggestions were made.Results and Conclusion 389 questionnaires were sent out and 371 effective questionnaires were recovered.The effective recovery rate was 95.37%.The universities surveyed mainly recruited undergraduates,accounting for 66.7%of the total.Most of the employees in the online drug sales enterprises surveyed graduated from secondary school or universities,accounting for 91.9%.The number of graduates surveyed who were willing to work in the online drug sales enterprises was low,accounting for only 8.67%.Besides,it was difficult for online drug sellers to be promoted,71.7%of the respondents had no promotion opportunities.In view of the main problems such as the low professional quality of online drug sellers,their low willingness to engage in online drug sales,and few promotion opportunities,it is suggested the reform of licensed pharmacists should be deepened to improve the number and quality of online drug sellers.Meanwhile,we should learn the advanced experience from developed countries.In addition,the income and welfare of the online drug sellers should be improved.Lastly,a unified management platform must be set up for online drug sellers by technical means.
基金The research of the first two authors were supported by the U.S.Census Bureau Prime Contract No:YA1323-09-CQ-0054The research of the second author was also partially supported by an NSF grants DMS-1305474 and DMS-1612873.
文摘The Current Population Survey(CPS)is a monthly household sample survey with a sample consisting of eight rotation groups.Sampled individuals of a rotation group are interviewed four consecutive months and another four consecutive months after resting eight consecutive months.A composite-type estimator is adopted in the CPS for the estimation of the monthly population total,which combines sample information from the current month’s survey and previous months using the fact that 75%households have data for two consecutive months.There are two values,A and K,in the composite estimator to decide how to combine the available information,and thus this estimator is called the AK composite estimator.In this paper,we use a formula of the meansquared error of AK composite estimator and propose an easy-to-use method of choosing A and K based on data,which evolves the estimation of some population quantities using the method of moments and replication.Some numerical studies are conducted to illustrate the effectiveness of the proposed method.
文摘A recent paper [Thibaudeau, Slud, and Gottschalck (2017). Modeling log-linear conditional probabilities for estimation in surveys. The Annals of Applied Statistics, 11, 680–697] proposed a ‘hybrid’method of survey estimation combining coarsely cross-classified design-based survey-weightedtotals in a population with loglinear or generalised-linear model-based conditional probabilitiesfor cells in a finer cross-classification. The models were compared in weighted and unweightedforms on data from the US Survey of Income and Program Participation (SIPP), a large nationallongitudinal survey. The hybrid method was elaborated in a book-chapter [Thibaudeau, Slud,& Cheng (2019). Small-area estimation of cross-classified gross flows using longitudinal survey data. In P. Lynn (Ed.), Methodology of longitudinal surveys II. Wiley] about estimating grossflows in (two-period) longitudinal surveys, by considering fixed versus mixed effect versionsof the conditional-probability models and allowing for 3 or more outcomes in the later-periodcategories used to define gross flows within generalised logistic regression models. The methodology provided for point and interval small-area estimation, specifically area-level two-periodlabour-status gross-flow estimation, illustrated on a US Current Population Survey (CPS) datasetof survey respondents in two successive months in 16 states. In the current paper, that data analysis is expanded in two ways: (i) by analysing the CPS dataset in greater detail, incorporatingmultiple random effects (slopes as well as intercepts), using predictive as well as likelihood metrics for model quality, and (ii) by showing how Bayesian computation (MCMC) provides insightsconcerning fixed- versus mixed-effect model predictions. The findings from fixed-effect analyseswith state effects, from corresponding models with state random effects, and fom Bayes analysisof posteriors for the fixed state-effects with other model coefficients fixed, all confirm each otherand support a model with normal random state effects, independent across states.