A simulation study designed to evaluate the pseudo-R2 proposed by Spiess and Keller (1999) suggests that this measure represents the goodness-of-fit not only of the systematic part, but also of the assumed correlation structure in binary panel probit models.

The results of two simulation studies suggest a mixed `generalized estimating/pseudo-score equations' approach to lead to more efficient estimators than a GEE approach proposed by Qu, Williams, Beck and Medendorp (1992) or a three-stage approach as proposed e.g. by Schepers, Arminger and...

Research on processes of innovation has emphasised the role of (publicly funded) research institutions (RTOs) as well as the embeddedness of innovation procedures in a systemic context. This paper deals with the changing contribution of RTOs to innovation systems due to the emergence of a highly...

This paper investigates the differences between directly and indirectly seasonally adjusted aggregates. This difference is derived analytically for linear seasonal adjustment methods. GDP data for five European countries and three classes of seasonal adjustment methods are used to show...

The emergence and market success of Linux in recent years has been impressive. Contrary to common belief, commercial enterprises are active only in the provision of services (including distribution) related to Linux. The emergence of this service market has paved the way for Linux to become a...

Institutionen werden in diesem Beitrag als Regeln menschlichen Handelns begriffen. Im einzelnen geht es um eine Analyse der in den Wirtschaftswissenschaften angewandten Regeln zur Untersuchung individueller Erwerbsentscheidungen (rational choice Ansatz), um Regeln, die in Form von...

This paper explores the implications of possible bias cancellation using Rubin-style matching methods with complete and incomplete data. After reviewing the na?ve causal estimator and the approaches of Heckman and Rubin to the causal estimation problem, we show how missing data can complicate...

In many countries, collectively financed health insurance systems or health services delivery systems (such as the NHS) exist. Typically, these institutions are financed via general taxes or specific contributions levied on earnings. As benefits are not dependent upon income, this implies a...

It is now a commonplace that the unfunded public pension systems of many OECD countries will run into severe financing problems in the coming decades due to a dramatically increasing pensioner/worker ratio. While this diagnosis is completely undisputed, there is still a vigorous debate on the...