全文获取类型
收费全文 | 93767篇 |
免费 | 1984篇 |
国内免费 | 3篇 |
专业分类
管理学 | 12713篇 |
民族学 | 539篇 |
人才学 | 25篇 |
人口学 | 7305篇 |
丛书文集 | 532篇 |
教育普及 | 2篇 |
理论方法论 | 9542篇 |
综合类 | 2185篇 |
社会学 | 43820篇 |
统计学 | 19091篇 |
出版年
2023年 | 523篇 |
2021年 | 580篇 |
2020年 | 1526篇 |
2019年 | 2245篇 |
2018年 | 2147篇 |
2017年 | 3221篇 |
2016年 | 2428篇 |
2015年 | 2068篇 |
2014年 | 2653篇 |
2013年 | 18964篇 |
2012年 | 2470篇 |
2011年 | 2260篇 |
2010年 | 1993篇 |
2009年 | 2222篇 |
2008年 | 2085篇 |
2007年 | 1931篇 |
2006年 | 2112篇 |
2005年 | 2352篇 |
2004年 | 2250篇 |
2003年 | 1915篇 |
2002年 | 2028篇 |
2001年 | 2075篇 |
2000年 | 1869篇 |
1999年 | 1766篇 |
1998年 | 1525篇 |
1997年 | 1381篇 |
1996年 | 1349篇 |
1995年 | 1368篇 |
1994年 | 1335篇 |
1993年 | 1318篇 |
1992年 | 1348篇 |
1991年 | 1273篇 |
1990年 | 1245篇 |
1989年 | 1109篇 |
1988年 | 1167篇 |
1987年 | 1040篇 |
1986年 | 959篇 |
1985年 | 1112篇 |
1984年 | 1197篇 |
1983年 | 1068篇 |
1982年 | 988篇 |
1981年 | 892篇 |
1980年 | 846篇 |
1979年 | 913篇 |
1978年 | 809篇 |
1977年 | 719篇 |
1976年 | 683篇 |
1975年 | 656篇 |
1974年 | 550篇 |
1973年 | 470篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
921.
"Net undercount rates in the U.S. decennial census have been steadily declining over the last several censuses. Differential undercounts among race groups and geographic areas, however, appear to persist. In the following, we examine and compare several methodologies for providing small area estimates of census coverage by constructing artificial populations. Measures of performance are also introduced to assess the various small area estimates. Synthetic estimation in combination with regression modelling provide the best results over the methods considered. Sampling error effects are also simulated. The results form the basis for determining coverage evaluation survey small area estimates of the 1900 decennial census." 相似文献
922.
M. Ahsanullah 《Statistical Papers》1988,29(1):151-157
Suppose X1, X2, ..., Xm is a random sample of size m from a population with probability density function f(x), x>0 and let X1,m<...m,m be the corresponding order statistics. We assume m as an integer valued random variable with P(m=k)=p(1?p)k?1, k=1, 2, ... and 0 and n X1,n for fixed n characterizes the exponential distribution. In this paper we prove that under the assumption of monotone hazard rate the identical distribution of and (n?r+1) (Xr,n?Xr?1,n) for some fixed r and n with 1≤r≤n, n≥2, X0,n=0, characterizes the exponential distribution. Under the assumption of monotone hazard rate the conjecture of Kakosyan, Klebanov and Melamed follows from the above result with r=1. 相似文献
923.
In this paper the timing of maternity is estimated by a hazard model. The novel aspect of this paper is that it is shown that wages and total household labor income have a significant effect on the timing of maternity. Both the wage rate of the woman and the wage rate of the husband have a negative effect on the timing of maternity. Total household labor income increases the probability of having a child at an earlier age. Calculated elasticities show that the timing of maternity is relatively elastic with respect to wage rates. However, the elasticities of the decision whether or not to have children altogether are much smaller. Women working in the labor market delay the timing of maternity compared to non-participating women. Attending school has the same effect. Until the age of 28 the maternity hazard increases with age, after that it decreases.We benefited from comments on previous drafts by Siv Gustafsson, Joop Hartog, Peter Kee, Herriette Maassen van den Brink, Eddie Mekkelholt, Joop Odink, Hessel Oosterbeek, Hans van Ophem, Gusta Renes, Andre Voskamp, two anonymous referees, and the Managing Editor of this Journal. This paper is a revised version of a paper presented at the third annual meeting of the European Society for Population Economics, Paris, June 1989. The usual disclaimer applies. 相似文献
924.
A comparison of the Korean minorities in China and Japan 总被引:1,自引:0,他引:1
Min PG 《The International migration review》1992,26(1):4-21
"This article compares the Korean minorities in China and Japan in their differential levels of cultural autonomy and ethnic identity....In explaining the differential levels of ethnicity between the two Korean minority groups, this paper focuses on the basic differences in minority policy between the two countries; the difference in the context of migration; the existence or absence of a territorial base; and the differential levels of influence from Korea." 相似文献
925.
Elective single mothers are adult, unmarried women who intentionally become mothers. This study utilized longitudinal data about 17 Caucasian, elective single mothers and their children to identify fathers' roles in these families, and to understand children's views of their fathers. These single mothers and their children resided for the first six years of the children's lives in father-absent households. By age six, most of the children had ghost fathers, whom they had never met or knew little about. The data suggest that the father often becomes a family secret, and that children may blame themselves for their fathers' absence. 相似文献
926.
927.
928.
Garry J. Smith Ph.D. 《Journal of gambling studies / co-sponsored by the National Council on Problem Gambling and Institute for the Study of Gambling and Commercial Gaming》1992,8(4):331-349
A paradox currently exists regarding legal sports gambling in North America: various forms are flourishing in Nevada, Oregon, and several Canadian provinces, while at the same time the United States Congress is conducting hearings on two bills that would prohibit any new state-sponsored sports gambling initiatives. This study examines the issue of why some jurisdictions are enthusiastic about legal sports gambling while others strongly resist the concept. In reviewing these divergent viewpoints, a case study of the newfledged Canadian Sport Select gambling format is presented. This example is used to highly the perils and payoffs of a typical state-sponsored sports gambling scheme, with a view toward broadening our understanding of how they work and how they might be fairer to the public. 相似文献
929.
930.