The Importance of Being Vigilant: Has ECB Communication Influenced Euro Area Inflation Expectations?

Using daily data on inflation-indexed bonds, we find evidence of a negative relationship between ECB communication regarding risks to price stability - measured on the basis of the frequency and strength of the keyword ‘vigilance’ - and changes in euro area break-even inflation. However, this result is only found for the second half of 2005. At that time, the start of a tightening of ECB monetary policy was increasingly likely. This suggests that communication should be closely in line with policy actions before it can be effective. Still, we also find that the economic significance of this type of communication has been small.central bank communication, ECB, inflation expectations

On the refractive index for a nonmagnetic two-component medium: resolution of a controversy

The refractive index of a dielectric medium comprising both passive and inverted components in its permittivity was determined using two methods: (i) in the time domain, a finite-difference algorithm to compute the frequency-domain reflectance from reflection data for a pulsed plane wave that is normally incident on a dielectric half-space, and (ii) in the frequency domain, the deflection of an obliquely incident Gaussian beam on transmission through a dielectric slab. The dielectric medium was found to be an active medium with a negative real part for its refractive index. Thereby, a recent controversy in the scientific literature was resolved.Comment: manuscript submitted to Optics Communication

High School Adolescents’ Perceptions of the Parent–Child Sex Talk: How Communication, Relational, and Family Factors Relate to Sexual Health

This research focuses on how high school adolescents’ (n= 159) perceptions of parent– adolescent communication about sex, including communication frequency, parent–child closeness, parents’ communication competence and effectiveness, as well as the larger family environment relates to sexual risk-taking and permissive sexual attitudes. Findings show that perceived parental communication competence and effectiveness were the strongest negative predictors of adolescents’ permissive sexual attitudes and sexual risk-taking, whereas peer communication frequency was a significant positive predictor. In contrast with previous research, adolescents’ perception of parent communication frequency and family communication climate (e.g., conversation orientation and conformity orientation) was unrelated to adolescents’ sexual risk

Positive words carry less information than negative words

We show that the frequency of word use is not only determined by the word length \cite{Zipf1935} and the average information content \cite{Piantadosi2011}, but also by its emotional content. We have analyzed three established lexica of affective word usage in English, German, and Spanish, to verify that these lexica have a neutral, unbiased, emotional content. Taking into account the frequency of word usage, we find that words with a positive emotional content are more frequently used. This lends support to Pollyanna hypothesis \cite{Boucher1969} that there should be a positive bias in human expression. We also find that negative words contain more information than positive words, as the informativeness of a word increases uniformly with its valence decrease. Our findings support earlier conjectures about (i) the relation between word frequency and information content, and (ii) the impact of positive emotions on communication and social links.Comment: 16 pages, 3 figures, 3 table

On the Resolution of the Time-Like Singularities in Reissner-Nordstrom and Negative-Mass Schwarzschild

Certain time-like singularities are shown to be resolved already in classical General Relativity once one passes from particle probes to scalar waves. The time evolution can be defined uniquely and some general conditions for that are formulated. The Reissner-Nordstrom singularity allows for communication through the singularity and can be termed "beam splitter" since the transmission probability of a suitably prepared high energy wave packet is 25%. The high frequency dependence of the cross section is w^{-4/3}. However, smooth geometries arbitrarily close to the singular one require a finite amount of negative energy matter. The negative-mass Schwarzschild has a qualitatively different resolution interpreted to be fully reflecting. These 4d results are similar to the 2d black hole and are generalized to an arbitrary dimension d>4.Comment: 47 pages, 5 figures. v2: See end of introduction for an important note adde

Knowledge Communication in Product Development Projects

During the last decades, a number of studies have been concerned with com-munication related to new product development. These have looked at either intra-organizational communication between departments or communication between new product development teams and external stakeholders such as customers or suppliers. Only little research, however, has combined internal and external stakeholder communication and explored the role of technology uncertainty on communication. The purpose of this study is to examine how technology uncertainty affects project manager communication behavior during new product development. We carried out an embedded case study of a major NPD project in the automation industry. The findings indicate that technology uncertainty is positively related to communication frequency between project manager and project stakeholders during the early phase of NPD project. In addition we found a negative association between technology uncertainty and the breadth and depth of communication between project manager and stakeholders in early phase of the NPD project. These findings indicate that under high technology uncertainty, managers of NPD projects modify their communication behavior not only with respect to how frequently they communicate with stakeholders, but also to which stakeholders they communicate and how deeply they engage different stakeholders in different phases of the new product development project.

The law of brevity in macaque vocal communication is not an artifact of analyzing mean call durations

Words follow the law of brevity, i.e. more frequent words tend to be shorter. From a statistical point of view, this qualitative definition of the law states that word length and word frequency are negatively correlated. Here the recent finding of patterning consistent with the law of brevity in Formosan macaque vocal communication (Semple et al., 2010) is revisited. It is shown that the negative correlation between mean duration and frequency of use in the vocalizations of Formosan macaques is not an artifact of the use of a mean duration for each call type instead of the customary 'word' length of studies of the law in human language. The key point demonstrated is that the total duration of calls of a particular type increases with the number of calls of that type. The finding of the law of brevity in the vocalizations of these macaques therefore defies a trivial explanation.Comment: Little improvements of the statistical argument

Teacher Perceptions Of Parent-Teacher Communications And Practice

It has been established in prior research that parent involvement and school-family partnerships have the potential to positively impact student achievement; however, creating and maintaining positive and productive parent-teacher communication can be difficult. Since teachers function as the link between school and the home, there is an increased need to study the perspectives and experiences of teachers. The purpose of this study was to examine the relationship between teacher perceptions of parent-teacher relationships, teacher conversation competence, and teacher communication frequency with parents. This study involved an online survey distributed to 234 participants via Amazon Mechanical Turk. The following results were found to be significant: teacher relationship beliefs and the presence of a teacher contact mandate had a negative correlation with communication frequency, and teacher conversation competence had a positive correlation with communication frequency. In regression analysis, relationship beliefs and contact mandate were suggested to be significant negative predictors of communication frequency, whereas conversation competence was a significant positive predictor. SEM analysis suggested that only conversation competence was a significant predictor of communication frequency, which raises questions about the potential for mediation. The major limitation of this study was the lack of convergent validity, which could have arisen due to issues with individual measures and exacerbated by a heterogeneous and potentially uncommitted online sample pool. Potential implications of this study include providing information to inform current teaching practice and improving teacher education and professional development. If teachers feel more prepared entering into parent-teacher dialogue, student achievement could be improved

Measuring social dynamics in a massive multiplayer online game

Quantification of human group-behavior has so far defied an empirical, falsifiable approach. This is due to tremendous difficulties in data acquisition of social systems. Massive multiplayer online games (MMOG) provide a fascinating new way of observing hundreds of thousands of simultaneously socially interacting individuals engaged in virtual economic activities. We have compiled a data set consisting of practically all actions of all players over a period of three years from a MMOG played by 300,000 people. This large-scale data set of a socio-economic unit contains all social and economic data from a single and coherent source. Players have to generate a virtual income through economic activities to `survive' and are typically engaged in a multitude of social activities offered within the game. Our analysis of high-frequency log files focuses on three types of social networks, and tests a series of social-dynamics hypotheses. In particular we study the structure and dynamics of friend-, enemy- and communication networks. We find striking differences in topological structure between positive (friend) and negative (enemy) tie networks. All networks confirm the recently observed phenomenon of network densification. We propose two approximate social laws in communication networks, the first expressing betweenness centrality as the inverse square of the overlap, the second relating communication strength to the cube of the overlap. These empirical laws provide strong quantitative evidence for the Weak ties hypothesis of Granovetter. Further, the analysis of triad significance profiles validates well-established assertions from social balance theory. We find overrepresentation (underrepresentation) of complete (incomplete) triads in networks of positive ties, and vice versa for networks of negative ties...Comment: 23 pages 19 figure