This article analyses empirically the main existing theories on income and population city growth: increasing returns to scale, locational fundamentals and random growth. To do this we consider a large database of urban, climatological and macroeconomic data from 1,173 US cities observed in 1990 and 2000. The econometric model is robust to the presence of spatial effects. Our analysis shows the...

The characteristics of a sample of workers from the Panel Study of Income Dynamics who were laid off permanently or whose plants closed between 1968 and 1981 are examined. The displaced workers are found to have roughly the same characteristics as the typical labor-force participant, while those laid off are somewhat younger and less educated. A theoretical model of the losses resulting from di...

The  present  study  aimed  at  investigating  DIF  sources  on  an  EFL  reading  comprehension test.  Accordingly,  2  DIF  detection  methods,  logistic  regression  (LR)  and  item  response theory  (IRT),  were  used  to  flag  emergent  DIF  of  203  (110  females  &  93  males)  Iranian EFL examinees’ performance on a reading comprehension test. Seven hypothetical DIF sources were examin...

DNA double strand breaks (DSBs) are the most dangerous form of DNA damage and need to be repaired efficiently in order to maintain genomic stability. The kinase ATM becomes activated upon recognition of DSBs and transduces this into cell cycle checkpoint activation and DNA repair. There are two main pathways by which DSBs can be repaired: Non-homologous end joining (NHEJ) and homologous recombi...

Worker Displacement during the Transition: Experience from Slovenia The transition to market in Slovenia created labor displacements that were on par or greater than that experienced in North America in the 1980s. A simple theoretical model suggests that factors which raise the probability of layoff should also increase the probability of a quit, predictions that are borne out in data. Probabil...

The two visual systems hypothesis in neuroscience suggests that pointing without visual feedback may be less affected by spatial visual illusions than cognitive interactions such as judged target location. Our study examined predictions of this theory for target localization on a large-screen display. We contrasted pointing interactions under varying levels of visual feedback with location judg...