How survey mode affects estimates of the prevalence of gambling harm: a multisurvey study

Recent general population surveys have produced highly variable estimates of the extent of problem gambling in Great Britain, ranging from as low as 0.4% to as high as 2.7% of adults. This level of uncertainty over the true level of problem gambling creates difficulties for policy makers and those planning treatment and support services for individuals and families affected by problem gambling. In this article, we assess the extent to which differences in approaches to sampling and measurement between surveys contribute to variability in estimates of problem gambling. We compare estimates of problem gambling using the Problem Gambling Severity Index across eight different surveys conducted at approximately the same time but which use different sampling and measurement strategies. Our findings show that surveys conducted online produce substantially higher estimates of problem gambling compared with in-person interview surveys. This is because online surveys, whether using probability or non-probability sampling, overrepresent people who are more likely to gamble online and to gamble frequently, relative to the proportions of these groups in the general population

The Effect of Probing "Don't Know" Responses on Measurement Quality and Nonresponse in Surveys

In survey interviews, “Don’t know” (DK) responses are commonly treated as missing data. One way to reduce the rate of such responses is to probe initial DK answers with a follow-up question designed to encourage respondents to give substantive, non- DK responses. However, such probing can also reduce data quality by introducing additional or differential measurement error. We propose a latent variable model for analyzing the effects of probing on responses to survey questions. The model makes it possible to separate measurement effects of probing from true differences between respondents who do and do not require probing. We analyze new data from an exper- iment which compared responses to two multi-item batteries of questions with and without probing. In this study, probing reduced the rate of DK responses by around a half. However, it also had substantial measurement effects, in that probed answers were often weaker measures of constructs of interest than were unprobed answers. These effects were larger for questions on attitudes than for pseudo-knowledge ques- tions on perceptions of external facts. The results provide evidence against the use of probing of “Don’t know” responses, at least for the kinds of items and respondents considered in this study

Pathways from physical frailty to activity limitation in older people: identifying moderators and mediators in the English longitudinal study of ageing

Physical frailty increases the risk of future activity limitation, which in turn, compromises independent living of older people and limits their healthspan. Thus, we seek to identify moderators and mediators of the effect of physical frailty on activity limitation change in older people, including gender- and age-specific effects. In a longitudinal study using data from waves 2, 4, and 6 of the English Longitudinal Study of Ageing, unique physical frailty factor scores of 4,638 respondents aged 65 to 89 years are obtained from confirmatory factor analysis of physical frailty, which is specified by three indicators, namely slowness, weakness, and exhaustion. Using a series of autoregressive cross-lagged models, we estimate the effect of physical frailty factor score on activity limitation change, including its moderation by social conditions, and indirect effects through physical and psychological conditions. We find that the effect of physical frailty on activity limitation change is significantly stronger with older age, while it has significant indirect effects through low physical activity, depressive symptoms, and cognitive impairment. In turn, indirect effects of physical frailty through low physical activity and cognitive impairment are stronger with older age. Sensitivity analyses suggest that these effects vary in their robustness to unmeasured confounding. We conclude that low physical activity, depressive symptoms, and cognitive impairment are potentially modifiable mediators on pathways from physical frailty to activity limitation in older people, including those who are very old. This evidence offers support for population-level interventions that target these conditions, to mitigate the effect of physical frailty on activity limitation, and thereby enhance healthspan

Policing by consent: understanding the dynamics of police power and legitimacy

This is the first of the country-specific European Social Survey topline results reports. Focusing on UK data from the Round 5 module entitled ‘trust in justice,' we link people’s perceptions of police legitimacy to their compliance with the law and their willingness to cooperate with the police and criminal courts. We also extend the existing literature by addressing wider forms of trust and people’s attachment to order and security. Framing the findings in the context of a long and rich history of policing by consent, we show the value of the European Social Survey in shaping public policy, practice and debate

Teknologisen oppimisympäristön vaikutukset opettajiin ja oppilaisiin

Tiivistelmä. Kandidaatintyössä selvitetään kiihtyneen digitalisaation aiheuttamien oppimisympäristön muutoksien vaikutuksia opettajiin sekä oppilaisiin. Tutkielma koetaan tarpeelliseksi, sillä yhteiskunnassa on jatkuvaa keskustelua teknologian kuormittavasta vaikutuksesta opettajien keskuudessa, sekä useista teknologian haitallisista vaikutuksista lasten keskuudessa. Tavoitteenamme on selvittää mahdollisimman tuoretta lähdekirjallisuutta hyödyntäen useita teknologisen oppimisympäristön vaikutuksia pääsääntöisesti peruskouluikäisiin oppilaisiin sekä heidän opettajiinsa liittyen. Pohjustaaksemme vaikutuksien selvittämistä, tutkimme ensin lähdekirjallisuuden avulla myös teknologisen oppimisympäristön nykytilannetta Suomessa. Tutkielma on tehty kuvailevana kirjallisuuskatsauksena, jolloin se pohjaa aiemmin julkaistuun tutkimustietoon, sekä sen arvioimiseen. Teknologiaa ja digitalisaatiota käsitellessä lähdekirjallisuuden tuoreus on erityisen tärkeää, sillä aihe elää erittäin vilkkaasti digitalisaation liepeissä. Teknologia on erittäin nopeasti uusiutuvaa, joten aiheesta tehty tutkimuskin vanhenee erittäin nopeasti. Olemme huomioineet tämän lähdekirjallisuutta valitessa, keskittyen siksi mahdollisimman uuteen tutkimukseen. Tutkimukseen poimimme käsittelemämme lähdekirjallisuuden pohjalta muutamia pinnalle nousseita vaikutuksia opettajien ja oppilaiden keskuudessa, jotka koimme erityisen tärkeiksi. Teknologiset oppimisympäristöt ilmenivät opettajien ammatissa teknologisena kuormittavuutena ja -voimavarana, sekä teknostressin muodossa. Oppilailla digitalisoituneen oppimisympäristön lähdekirjallisuudesta pinnalle nousi ruutuajan lisääntyminen, nettikiusaamisen ilmeneminen sekä muuttuneiden oppimisympäristöjen vaikutukset. Molemmista kohderyhmistä löytyi sekä positiivisia, että negatiivisia vaikutteita teknologian pohjalta. On hankalaa puntaroida, onko positiivisten vaikutusten painoarvo suurempi kuin negatiivisten, mutta tutkimuksen tavoitteena ei olekaan selvittää kyseistä eroa. Keskitymme tutkimuksessa vain vaikutuksien ilmi tuomiseen, sekä niiden käsittelemiseen

Optical Technologies for UV Remote Sensing Instruments

Over the last decade significant advances in technology have made possible development of instruments with substantially improved efficiency in the UV spectral region. In the area of optical coatings and materials, the importance of recent developments in chemical vapor deposited (CVD) silicon carbide (SiC) mirrors, SiC films, and multilayer coatings in the context of ultraviolet instrumentation design are discussed. For example, the development of chemically vapor deposited (CVD) silicon carbide (SiC) mirrors, with high ultraviolet (UV) reflectance and low scatter surfaces, provides the opportunity to extend higher spectral/spatial resolution capability into the 50-nm region. Optical coatings for normal incidence diffraction gratings are particularly important for the evolution of efficient extreme ultraviolet (EUV) spectrographs. SiC films are important for optimizing the spectrograph performance in the 90 nm spectral region. The performance evaluation of the flight optical components for the Solar Ultraviolet Measurements of Emitted Radiation (SUMER) instrument, a spectroscopic instrument to fly aboard the Solar and Heliospheric Observatory (SOHO) mission, designed to study dynamic processes, temperatures, and densities in the plasma of the upper atmosphere of the Sun in the wavelength range from 50 nm to 160 nm, is discussed. The optical components were evaluated for imaging and scatter in the UV. The performance evaluation of SOHO/CDS (Coronal Diagnostic Spectrometer) flight gratings tested for spectral resolution and scatter in the DGEF is reviewed and preliminary results on resolution and scatter testing of Space Telescope Imaging Spectrograph (STIS) technology development diffraction gratings are presented

The detection and modeling of direct effects in latent class analysis

Several approaches have been proposed for latent class modeling with external variables, including one-step, two-step and three-step estimators. However, very little is known yet about the performance of these approaches when direct effects of the external variable to the indicators of latent class membership are present. In the current article, we compare those approaches and investigate the consequences of not modeling these direct effects when present, as well as the power of residual and fir statistics to identify such effects. The results of the simulations show that not modeling direct effect can lead to severe parameter bias, especially with a weak measurement model. Both residual and fit statistics can be used to identify such effects, as long as the number and strength of these effects is low and the measurement model is sufficiently strong

Two-stage multilevel latent class analysis with covariates in the presence of direct effects

Multivariate analysis of psychological dat

Surface Layers in General Relativity and Their Relation to Surface Tensions

For a thin shell, the intrinsic 3-pressure will be shown to be analogous to -A, where A is the classical surface tension: First, interior and exterior Schwarzschild solutions will be matched together such that the surface layer generated at the common boundary has no gravitational mass; then its intrinsic 3-pressure represents a surface tension fulfilling Kelvin's relation between mean curvature and pressure difference in the Newtonian limit. Second, after a suitable definition of mean curvature, the general relativistic analogue to Kelvin's relation will be proven to be contained in the equation of motion of the surface layer.Comment: 12 pages, LaTeX, no figur

Incommensurable worldviews? Is public use of complementary and alternative medicines incompatible with support for science and conventional medicine?

Proponents of controversial Complementary and Alternative Medicines, such as homeopathy, argue that these treatments can be used with great effect in addition to, and sometimes instead of, ?conventional? medicine. In doing so, they accept the idea that the scientific approach to the evaluation of treatment does not undermine use of and support for some of the more controversial CAM treatments. For those adhering to the scientific canon, however, such efficacy claims lack the requisite evidential basis from randomised controlled trials. It is not clear, however, whether such opposition characterises the views of the general public. In this paper we use data from the 2009 Wellcome Monitor survey to investigate public use of and beliefs about the efficacy of a prominent and controversial CAM within the United Kingdom, homeopathy. We proceed by using Latent Class Analysis to assess whether it is possible to identify a sub-group of the population who are at ease in combining support for science and conventional medicine with use of CAM treatments, and belief in the efficacy of homeopathy. Our results suggest that over 40% of the British public maintain positive evaluations of both homeopathy and conventional medicine simultaneously. Explanatory analyses reveal that simultaneous support for a controversial CAM treatment and conventional medicine is, in part, explained by a lack of scientific knowledge as well as concerns about the regulation of medical research