A family of shrinkage estimators for Weibull shape parameter in censored sampling

In this paper a new class of shrinkage estimators has been introduced for the shape parameter in an independently identically distributed two-parameterWeibull model under censored sampling. The main idea is to incorporate the prior guessed value by correcting the standard estimator, which is essentially an unbiased estimator, with optimally weighted ratios of the guessed value and the standard estimator, instead of considering a convex combination of the standard estimator and the difference of the guessed value and the standard estimator. The resulting estimator dominates the standard estimator in a surprisingly large neighborhood of the guessed value. The suggested estimator has also been compared with the minimum mean squared error estimator and a class of estimators suggested by Singh and Shukla in IAPQR Trans 25(2), 107–118, 2000. It is found that the suggested class of estimators has lesser bias as well as lesser mean squared error than its competitors subject to certain conditions.      

The formation and outcomes of cohabiting and marital partnerships in early adulthood: the role of previous partnership experience

Summary.  We estimate a joint model of the formation and dissolution of cohabiting and marital unions among British women who were born in 1970. The focus of the analysis is the effect of previous cohabitation and marriage on subsequent partnership transitions. We use a multilevel simultaneous equations event history model to allow for residual correlation between the hazards of moving from an unpartnered state into cohabitation or marriage, converting a cohabiting union into marriage and dissolution of either form of union. A simultaneous modelling approach allows for the joint determination of these transitions, which may otherwise bias estimates of the effects of previous partnership outcomes on later transitions.     

More or Less Unequal? Evidence on the Pay of Men and Women from the British Birth Cohort Studies

Gender pay differences are not merely a problem for women returning to work and part‐time employees, but also for those in full‐time, continuous careers. In data from cohort studies, the gender wage gap for full‐time workers in their early thirties fell between 1978 and 2000. This equalization reflects improvements in women’s education and experience rather more than a move towards equal treatment. Indeed, had the typical woman full‐timer in 2000 been paid at men’s rates she would have actually received higher pay than the typical man. Within one cohort, passing from age 33 to 42, gender inequality increased. This was partly due to differences in the qualifications and experience of the women in employment at those points, but unequal treatment also rose among women employed full time at both ages.     

Antecedents of Innovativeness in Technology‐Based Services (TBS): Peering into the Black Box of Entrepreneurial Orientation

Innovativeness is the organization's capability for developing and introducing innovations. We argue that new combinations and recombinations of prior and new knowledge (by way of creating, assembling, and transforming knowledge) result in innovativeness in an organization. We further assert that a knowledge‐based focus on innovativeness is particularly important for firms that are technology‐based. The majority of studies focusing on innovativeness are in the entrepreneurship arena, and a large number of studies consider innovativeness as one of three dimensions of the entrepreneurial orientation (EO) construct, the other two dimensions being proactiveness and risk‐taking. However, recent research has suggested peering into the black box of EO by disaggregating the EO construct and examining the interrelationships among its three components. Hence, using the knowledge‐based view and drawing from multiple disciplines, our study conceptualizes innovativeness as a criterion variable and investigates the antecedent role of proactiveness and risk‐taking propensity on innovativeness in the context of technology‐based services (TBS). We hypothesize that both proactiveness and risk‐taking propensity exhibit a curvilinear relationship with innovativeness and introduce organizational structure formality as a moderator to further explicate these relationships. Our results show that proactiveness has a curvilinear (inverted U relationship) with innovativeness, and that this relationship is attenuated by organizational structure formality. Additional analysis indicates that in TBS firms, risk‐taking propensity has a positive linear relationship with innovativeness, and this relationship is accentuated by organizational structure formality. Finally, we discuss important conceptual and practical implications of our study and provide suggestions for future research.     

Child development and family resources: Evidence from the second generation of the 1958 British birth cohort

Studies of American and recently British children suggest that there is a link between family income and child development, in particular that one consequence of child poverty is to hold back cognitive development. This paper investigates the impact of family income, material deprivation, maternal education and child-rearing behaviour on an indicator of cognitive functioning, using British data on children aged 6 to 17 whose mothers are members of the 1958 Birth Cohort Study. The poorer average cognitive functioning among children from the lowest income groups could largely be accounted for, statistically, by the greater material disadvantage of these groups. These analyses provide evidence to suggest that low income has detrimental effects on children's cognitive functioning through the operation of longer-term material disadvantage, and that these effects may be mitigated by positive parental behaviours. Received: 31 July 1999/Accepted: 26 September 2000     

Emerging paradoxes in executive leadership: A theoretical interpretation of the tensions between corruption and virtuous values

The recent mini scandal surrounding questionable on-line postings of John Mackey, the founder and CEO of Whole Foods Market Inc., raises once again ethical challenges related to contemporary business leadership. Given his visible commitment to environmentally sound strategies and other responsible business practices, Mackey’s actions epitomize the irony and paradox that can surround executive leadership ethics. While this essay acknowledges the potential role of stricter legal constraints, punishments for offenders, decentralized governance systems, and rationalized structures that help prohibit power abuse, it views such rationalistic considerations alone to be inadequate. Rather, the authors suggest that the promotion of authentic virtuousness is an often overlooked yet indispensable part of any meaningful long term ethical leadership process.     

Application of time series models to detect regulatory patterns in nitrogen output of adult rats

The techniques of time series analysis are applied to data on the nitrogen output of adult rats with a view to understanding the underlying mechanism governing daily fluctuations in nitrogen output. The model was fitted to the nitrogen output of rats fed at different protein levels to observe any changes in the parameters. The analysis reveals that an autoregressive model of order one was an adequate fit for the nitrogen-output data when the rats were fed at protein requirement levels, and it undergoes a change at low protein levels. In particular, at the zero protein level, i.e. during the conditions of physiological stress, the nitrogen-output series were random for all the rats. Analysis thus shows that while the autoregressive model implies the existence of a regulatory mechanism underlying a given process, the random series implies conditions of physiological stress, i.e. the breakdown of a regulatory mechanism. This exercise highlights the importance of time series models in the field of physiology.     

A k-sample slippage test for location parameter

Lewis (1972) has proposed a test for the slippage of the location parameter of k- populations when the direction of the slippage is unknown. In this paper, an extension of this test is proposed. The distribution of the test statistic is obtained under the null hypothesis of no slippage and the power of the test is compared with that of another competitive test proposed by Conover (1968).     

Plans for the 1971 census of Canada

This article describes the plans which have been developed for the Census of Canada to be taken June 1, 1971. One of the most important features of this census will be the use of the Self-enumeration technique for the great majority of respondents. Other topics touched upon include the User Liaison Programme which established requirements, the Testing Programme which determined the methodology and some highlights of the Data Collection and Processing Phases of the operation. There is a brief discussion of the use of sampling in 1971 with particular emphasis on the benefits to be derived in increased quality and reliability of data, increased timeliness and reduction in respondent burden. The Quality Control procedures are described. The Post-censal Evaluation and Data Dissemination programmes are also dealt with.     

An Investigation of Equity as a Determinant of User Information Satisfaction

This paper reviews equity theory and proposes that perceived inequity in the allocation of management information systems (MIS) resources is likely to influence overall user information satisfaction (UIS). Therefore, in addition to currently identified factors such as quality of information products (QIP), user's knowledge and involvement level (KIL), and EDP staff and services (ESS), equity is also likely to be a relevant factor in determining overall UIS. The paper reports on a cross-sectional survey to obtain data for testing the relevance of equity related issues in the MIS context. Responses from 226 users showed a strong correlation (.67, p > .001) between equity and overall UIS. Further, the addition of equity to the previously identified factors that influence overall UIS (i.e., QIP, KIL, and ESS) significantly increased the explained variance (from .48 to .56). The results support the relevance of equity related issues in determining user attitudes. It is recommended that MIS researchers and professionals take into account the likely influence of equity perceptions on user attitudes and behavior, and strive to develop and implement equitable resource allocation mechanisms. Implications of the findings for future research in the areas of MIS, UIS construct, systems implementation, and management of MIS are also discussed.