A simple family of nonadditive quantum codes

Most known quantum codes are additive, meaning the codespace can be described as the simultaneous eigenspace of an abelian subgroup of the Pauli group. While in some scenarios such codes are strictly suboptimal, very little is understood about how to construct nonadditive codes with good performance. Here we present a family of nonadditive quantum codes for all odd blocklengths, n, that has a particularly simple form. Our codes correct single qubit erasures while encoding a higher dimensional space than is possible with an additive code or, for n of 11 or greater, any previous codes.Comment: 3 pages, new version with slight clarifications, no results are change

Subordinate Locus of Control, Leadership Styles and Job Satisfaction

This study investigated the relationship between management style and the personality variable locus of control on subordinate job satisfaction among employees of a Communications Center for a large municipal law enforcement agency. Unlike many of the past studies that investigated the relationship between employee internality and job satisfaction, this current study found that Internals and Externals did not differ in general satisfaction when both had perceptions of high considerate supervisory behavior. It was also hypothesized that locus of control would have a high negative correlation with general satisfaction. This hypothesis was not supported. The last hypothesis of this study involved the degree to which Internal and External subordinates would differ from one another when they perceived their supervisor to be high or low on both supervisory dimensions (considerations and initiating structure). A t-test for independent samples showed that the difference (on satisfaction) between those individuals with an Internal locus of control and those with and External locus of control was not significantly different when they perceived their supervisor to be high on both the consideration and initiating structure dimensions

THE FOODSERVICE INDUSTRY: A PROFILE AND EXAMINATION OF EASTERN FOODSERVICE DISTRIBUTORS

The foodservice industry has grown rapidly over the past two decades and represents a major market for agricultural producers. The expansion of the foodservice industry has precipitated changes in the organization and structure of the industry and its distribution chain. The central link of particular interest to suppliers is the foodservice distributor industry. In addition to describing the organizational and structural components of the foodservice industry, this research describes the function of the foodservice distributors and analyzes key characteristics of distributors located throughout the eastern United States.Agribusiness,

TESTING FOR DIFFERENCES IN CONSUMER ACCEPTANCE OF IDENTICALLY APPEARING POTATO VARIETIES

Like many other vegetables, potatoes are marketed by type (russet, round white, red), rather than by variety (Burbak, Katahdin, Pontiac). Although varieties of the same type have similar outward appearances, they are also known to have different internal and cooking characteristics. There has been considerable controversy over the need for variety identification promotion in the potato industry. A consumer response study that distinguished between user satisfaction with different potato varieties was viewed as a step toward resolving this issue.Consumer/Household Economics,

Data Note: People Served in Community Mental Health Programs and Employment

State mental health agencies provide a wide range of supports, including rehabilitation services and vocational and pre-vocational training, as well as supported and competitive employment supports. This Data Note explores how states vary in number and percentage of individuals who are employed among those served in Community Mental Health Programs (CMHPs), i.e., programs with all services provided in the community, rather than in an inpatient setting. It also explores national trends that occurred from 2002 to 2011

DETERMINANTS OF CONSUMERS' PURCHASE DECISION FOR MAINE ROUND WHITE POTATOES

Potatoes are marketed by type (i.e. round white, russet, red, etc.), rather than by variety. However, the round white varieties currently marketed by the Maine potato industry are known to differ considerably in terms of product characteristics. This study was designed to test the hypothesis that consumer acceptance of potatoes in home use varies by variety and to quantify how their level of acceptance and other characteristics impact their repurchase decision. A discrete choice model was used. The results indicated that consumers do differentiate round white potato varieties based on the performance of the potatoes in home use. Their willingness to repurchase the round white potatoes is affected by the variety used and the overall serving quality of the potatoes in home use.Consumer/Household Economics,

Genetic Markers as Instrumental Variables

The use of genetic markers as instrumental variables (IV) is receiving increasing attention from epidemiologists, economists, statisticians and social scientists. This paper examines the conditions that need to be met for genetic variants to be used as instruments. Although these have been discussed in the epidemiological, medical and statistical literature, they have not been well-defined in the economics and social science literature. The increasing availability of biomedical data however, makes understanding of these conditions crucial to the successful use of genotypes as instruments for modifiable risk factors. We combine the econometric IV literature with that from genetic epidemiology using a potential outcomes framework and review the IV conditions in the context of a social science application, examining the effect of child fat mass on academic performance.ALSPAC; Fat mass; Genetic Variants; Instrumental Variables; Mendelian Randomization; Potential Outcomes

Myth or Reality? Exploring Intergenerational Social Assistance Participation in Ontario, Canada

Is there an intergenerational causal link in social assistance (SA) participation? There is a dearth of research addressing this question, yet the discourse of ‘welfare dependency’ is hegemonic. The limited research that does attempt to tease out a causal link in intergenerational SA participation remains equivocal. Qualitative research is largely absent in welfare scholarship; research that might provide a more nuanced understanding of the dynamics underlying SA receipt. We employ an inductive qualitative analysis, using procedures from grounded theory, to understand SA participants’ experiences and perspectives on intergenerational SA usage. We find that the two causal mechanisms underlying intergenerational SA usage, the learning effect and conformity effect, require further investigation. The theoretical foundations fundamental in explaining a causal intergenerational link are shaken by our grounded theory approach

Genetic Markers as Instrumental Variables:An Application to Child Fat Mass and Academic Achievement

The use of genetic markers as instrumental variables (IV) is receiving increasing attention from economists. This paper examines the conditions that need to be met for genetic variants to be used as instruments. We combine the IV literature with that from genetic epidemiology, with an application to child adiposity (fat mass, determined by a dual-energy X-ray absorptiometry (DXA) scan) and academic performance. OLS results indicate that leaner children perform slightly better in school tests compared to their more adipose counterparts, but the IV findings show no evidence that fat mass affects academic outcomes.Instrumental variables; Mendelian randomization; Genetic variant; Potential outcomes; Academic performance; Educational attainment; Adiposity; Fat mass; Body Mass Index; ALSPAC

Child height, health and human capital: evidence using genetic markers

Height has long been recognised as associated with better outcomes: the question is whether this association is causal. We use children’s genetic variants as instrumental variables (IV) to deal with possible unobserved confounders and examine the effect of child and adolescent height on a wide range of outcomes: academic performance, IQ, self-esteem, symptoms related to depression and behavioural problems, including hyperactivity, emotional, conduct and peer problems. OLS findings show that taller children have higher IQ scores, perform better in school tests, and are less likely to have emotional or peer problems. The IV results differ. They show that taller children have better cognitive performance but, in contrast to the OLS, indicate that taller children are more likely to have behavioural problems. The magnitude of these IV estimates is large. For example, the effect of one standard deviation increase in height on IQ is comparable to the IQ difference for children born approximately 6 months apart within the same school year, while the increase in hyperactivity is comparable to the raw difference in hyperactivity between boys and girls.Child and adolescent height; human capital; mental health; behavioural outcomes; instrumental variables; Mendelian randomization; genetic variants; ALSPAC