On a generalization of Poisson sampling

In real-time sampling, the units of a population pass a sampler one by one. Alternatively the sampler may successively visit the units of the population. Each unit passes only once and at that time it is decided whether or not it should be included in the sample. The goal is to take a sample and efficiently estimate a population parameter. The list sequential sampling method presented here is called correlated Poisson sampling. The method is an alternative to Poisson sampling, where the units are sampled independently with given inclusion probabilities. Correlated Poisson sampling uses weights to create correlations between the inclusion indicators. In that way it is possible to reduce the variation of the sample size and to make the samples more evenly spread over the population. Simulation shows that correlated Poisson sampling improves the efficiency in many cases.     

Syntagmatic and Paradigmatic Synergism: Notes on “Lanigan’s ‘Encyclopedic Dictionary’”

Richard L. Lanigan, founder of the International Communicology Institute, has formulated a synergistic account of the relationship between sign-systems (semiotics) and lived experience (phenomenology). In this article I overview some of the technical vocabulary found within Lanigan’s “Semiotic Phenomenology” and attempt to clarify the parallel relations between (a) part/whole, (b) variance/invariance, (c) empirical/eidetic, and (d) context-dependence/decontextualization by examining the relationships between the syntagmatic and paradigmatic axes of discourse. I also contextualize the relationship between “information” and “communication” by locating the former mainly within the evolutionary advent of denotation, and I furthermore spell out the role that alphabetic literacy plays in fortifying paradigmatic and syntagmatic resources.     

Comparison of two human-machine-interfaces for cooperative maneuver-based driving

In the project "Conduct-by-Wire" which is founded by the German Research Foundation (DFG) cooperative maneuver based driving is examined. In this paper two different input devices (gesture recognition and tactile touch display) are compared in a simulator study with 29 participants. It shows that the major advantage of the gesture recognition is that there is no need for the driver to take his gaze off the road. In contrast, the number of gazes at the tactile touch display is significantly higher. The major advantage of the tactile touch display is that no input errors occurred during the test drives. Conversely, the gesture recognition was significantly worse. Nevertheless, further work is needed to decide which input device is the best.     

Unemployment and Endogenous Growth

In this paper we develop a two-sector endogenous growth model with a dual labour market, based on efficiency wages. Growth is driven by intentional R&D performed in the high-tech and high-wage sector. How a change in rivalry among firms affects simultaneously growth and unemployment is examined. On the one hand, an increase of the elasticity of substitution between the product varieties of different high-tech firms reduces market power and leads to higher growth but reduces job prospects. On the other hand, if barriers to entry exist, an increase of the number of rivals in the market (due to removal of entry barriers) leads to lower growth, whereas the effect on aggregate employment is ambiguous.     

Effects of repetition and consistency of personalization treatments on response rate in mail surveys

One unequivocal finding of past research has been that follow-ups improve response rates in mail surveys. Several ways to construct sophisticated data collection systems using follow-ups in combination with other response-improving techniques are discussed, giving rise to the issue of whether repetition of techniques in each follow-up is more effective than single use in the first mailing. Two experiments were conducted to examine the effects of repeated versus single implementation of personalization of the outside envelope. A consistent use of personalization procedures in each mailing obtained a higher response rate than an inconsistent one, consisting of personalization of the first mailing with impersonal follow-ups. A second experiment showed repeated personalization to be more effective than repeated impersonal mailings.     

Some new international comparisons of productivity performance at the sectoral level

Summary. We present several new measures of gross-output-based total factor productivity (TFP) at the sectoral level for manufacturing industries in the G-7 economies. We calculate measures of both TFP growth and comparative levels. These are obtained by combining conventional Organisation for Economic Co-operation and Development sectoral data on labour and capital inputs with data on intermediate inputs from national input–output tables. Additionally, we derive cyclically corrected measures of TFP growth. Our evidence shows that the considerable gap in TFP between the USA and other G-7 economies is closing but remains significant.     

Social policy and forms of family life in Europe

This paper presents unpublished data from an international comparative research project. A ten-country study analysed change and diversity informs of private life during the 1980s in comparable age groups of women (women of young parental age and women at the start of the postparental phase). Changes in forms of private life and their international diversity make up the sociological background for demographic change. The scientific and political assumptions view demographic diversity in Europe as an expression of the simultaneity of the non-simultaneous, of a unidimensional trend in changes informs of private life as a result of the dissolution of the traditional family and the subsequent increase in such forms. We show that although Europeans have to deal with similar trends, they are framed by various national and cultural traditions and different social policy guiding principles and actions. Social policy profiles define various "normality weightings" for (prospective) parents'options. Of particular significance is how States differ in reconciling the demands of family and work. Differences in compatibility between family and professional life are exemplified by what Kaufmann (1990) calls the "structural lack of consideration" that politics and society have for the family.     

Make assurance double sure: combination of two disclosure limitation methods and estimation of general regression models

In order to guarantee confidentiality and privacy of firm-level data, statistical offices apply various disclosure limitation techniques. However, each anonymization technique has its protection limits such that the probability of disclosing the individual information for some observations is not minimized. To overcome this problem, we propose combining two separate disclosure limitation techniques, blanking and multiplication of independent noise, in order to protect the original dataset. The proposed approach yields a decrease in the probability of reidentifying/disclosing individual information and can be applied to linear and nonlinear regression models. We show how to combine the blanking method with the multiplicative measurement error method and how to estimate the model by combining the multiplicative Simulation-Extrapolation (M-SIMEX) approach from Nolte (, 2007) on the one side with the Inverse Probability Weighting (IPW) approach going back to Horwitz and Thompson (J. Am. Stat. Assoc. 47:663–685, 1952) and on the other side with matching methods, as an alternative to IPW, like the semiparametric M-Estimator proposed by Flossmann (, 2007). Based on Monte Carlo simulations, we show that multiplicative measurement error combined with blanking as a masking procedure does not necessarily lead to a severe reduction in the estimation quality, provided that its effects on the data generating process are known.     

√n-CONSISTENT ESTIMATION IN A RANDOM COEFFICIENT AUTOREGRESSIVE MODEL

This paper deals with √n-consistent estimation of the parameter μ in the RCAR(l) model defined by the difference equation X_j=(μ+U_j)X_j-l+ej (jε Z), where {e_j: jε Z} and {U_j: jε Z} are two independent sets of i.i.d. random variables with zero means, positive finite variances and E[(μ+U₁)²] < 1. A class of asymptotically normal estimators of μ indexed by a family of bounded measurable functions is introduced. Then an estimator is constructed which is asymptotically equivalent to the best estimator in that class. This estimator, asymptotically equivalent to the quasi-maximum likelihood estimator derived in Nicholls & Quinn (1982), is much simpler to calculate and is asymptotically normal without the additional moment conditions those authors impose.