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841.
Jing Ai PhD Patrick L. Brockett PhD. Linda L. Golden PhD. 《North American actuarial journal : NAAJ》2013,17(4):438-458
Abstract We present an unsupervised learning method for classifying consumer insurance claims according to their suspiciousness of fraud versus nonfraud. The predictor variables contained within a claim file that are used in this analysis can be binary, ordinal categorical, or continuous variates. They are constructed such that the ordinal position of the response to the predictor variable bears a monotonic relationship with the fraud suspicion of the claim. Thus, although no individual variable is of itself assumed to be determinative of fraud, each of the individual variables gives a “hint” or indication as to the suspiciousness of fraud for the overall claim file. The presented method statistically concatenates the totality of these “hints” to make an overall assessment of the ranking of fraud risk for the claim files without using any a priori fraud-classified or -labeled subset of data. We first present a scoring method for the predictor variables that puts all the variables (whether binary “red flag indicators,” ordinal categorical variables with different categories of possible response values, or continuous variables) onto a common –1 to 1 scale for comparison and further use. This allows us to aggregate variables with disparate numbers of potential values. We next show how to concatenate the individual variables and obtain a measure of variable worth for fraud detection, and then how to obtain an overall holistic claim file suspicion value capable of being used to rank the claim files for determining which claims to pay and the order in which to investigate claims further for fraud. The proposed method provides three useful outputs not usually available with other unsupervised methods: (1) an ordinal measure of overall claim file fraud suspicion level, (2) a measure of the importance of each individual predictor variable in determining the overall suspicion levels of claims, and (3) a classification function capable of being applied to existing claims as well as new incoming claims. The overall claim file score is also available to be correlated with exogenous variables such as claimant demographics or highvolume physician or lawyer involvement. We illustrate that the incorporation of continuous variables in their continuous form helps classification and that the method has internal and external validity via empirical analysis of real data sets. A detailed application to automobile bodily injury fraud detection is presented. 相似文献
842.
Board turnover in Taiwan’s public firms: An empirical study 总被引:2,自引:2,他引:0
Yunshi Liu Linda C. Wang Li Zhao David Ahlstrom 《Asia Pacific Journal of Management》2013,30(4):1059-1086
Using a data set of 220 Taiwanese public firms with 2,200 observations over a ten-year period representing Taiwan’s economic takeoff period in the late 1990s, as well as six follow-up interviews conducted with top managers several years hence, this research examines the propensity of an important change variable for firms: the turnover of boards of directors. Specifically, it examines the relationship between board turnover and the organization’s environment, firm performance, and the largest shareholder’s control during a key period of economic transition and growth for Taiwan. The results show that substantial changes in board composition, though still not especially common in Taiwan, do occur, even in closely held companies. Turnover in the board is negatively related to the largest shareholder’s control power as well as firm performance. Board changes however, are not related to the environmental munificence and dynamism. These results are rather consistent with related research on firms in ethnic Chinese communities which suggests that top management and board turnover while not common, does sometimes occur, and more recent institutional and industrial change in Taiwan is likely encouraging further governance reform. This has implications for important facets of firm governance and change, as well as expanding our knowledge about firms domiciled in an ethnic Chinese community, particularly during times of economic transition and growth. Follow-up interviews with four top managers from our sample, along with one consultant and one government official in Taiwan provided additional confirmation and clarification of our results. 相似文献
843.
The delivery of services in the community is a expanding area of health care due to the rapid shift from institutional to community care. However, limited attention has been given to accurately predict or measure nursing resource utilization. A workload measurement tool developed by the community care program at WestView Health Centre (Stony Plain, Alberta, Canada) sought to address the unique challenges of determining workload while caring for clients in their own homes. The implementation of this tool facilitated improved understanding of work requirements associated with each client on caseload. The continued use of this tool will lead to refinement of case mix and professional utilization, and may show benefits in the future for novice nurse growth, staff retention, and satisfaction. 相似文献
844.
Linda Loubert 《The Review of Black Political Economy》2008,35(1):31-41
Much debate from many political sides has ensued to raise attention to the struggle state legislatures face over school finance
issues. This study examines the changes in academic achievement, before and after increases in funding occur, to show that
money does matter. The uniqueness of this study is that it examines per pupil funding and academic achievement test scores,
Texas Assessment of Academic Skills (TAAS), not at the aggregated school district level, but at the neighborhood school level.
Using data from Dallas County public schools, we are able to see that even within school districts, as resources increase,
achievement improves.
相似文献
Linda LoubertEmail: |
845.
Linda A. Bailey 《The Review of Black Political Economy》2014,41(4):411-432
A simple theoretical model is presented in which higher relative arrest rates for blacks compared to whites lead to higher relative absenteeism (including tardiness) and ultimately a lower likelihood of placement in occupations where absenteeism is more costly, such as supervisory positions. Though the data do not allow for a direct test of the model, partial correlations provide some suggestive evidence. Controlling for city fixed effects and using an occupation prestige index to proxy for occupations with more costly absenteeism, higher relative arrest rates for blacks compared to whites are associated with relatively worse occupation placement compared to whites. The model and suggestive evidence make a case for further research into the spillover effect of criminal justice outcomes and for consideration of spillover effects in the costs and benefits of enforcement mechanisms which disproportionately affect blacks. 相似文献
846.
Making Small Numbers Count: Environmental and Financial Feedback in Promoting Eco-driving Behaviours
Energy conservation results in environmental (reduced emissions) and financial (reduced costs) savings. Consumers’ perception of the worthiness of changes in behaviour may differ depending on whether environmental or financial savings are emphasized. The current study investigated the effects of using either environmental or financial feedback in the context of eco-driving. Participants evaluated six scenarios describing different eco-driving behaviours. Participants in experimental groups were informed about either the environmental or financial savings realized by adopting the behaviours. A control group did not receive information on possible savings. Results indicated that, unlike commonly assumed, environmental savings are considered more worthwhile than commensurate financial savings. Yet, intentions to adopt eco-driving behaviours were mainly sensitive to the presence of feedback per se, rather than the content of feedback. We discuss the theoretical and practical implications of these findings. 相似文献
847.
Linda Sandris Larsen 《Journal of Economic Dynamics and Control》2012,36(2):266-293
The recent theoretical asset allocation literature has derived optimal dynamic investment strategies in various advanced models of asset returns. But how sensitive is investor welfare to deviations from the theoretically optimal strategy? Will unsophisticated investors do almost as well as sophisticated investors? This paper develops a general theoretical framework for answering such questions and applies it to three specific models of interest rate risk, stochastic stock volatility, and mean reversion and growth/value tilts of stock portfolios. Among other things, we find that growth/value tilts are highly valuable, but the hedging of time-varying stock risk premia is less important. 相似文献
848.
Goodwin L 《Journal of insurance medicine (New York, N.Y.)》2006,38(4):300-302
849.