Predicting Product Review Helpfulness Using Machine Learning and Specialized Classification Models

In this paper we focus on automatically classifying product reviews as either helpful or unhelpful using machine learning techniques, namely, SVM classifiers. Using LIBSVM and a set of Amazon product reviews from 25 product categories, we train models for each category to determine if a review will be helpful or unhelpful. Previous work has focused on training one classifier for all reviews in the data set, but we hypothesize that a distinct model for each of the 25 product types available in the review dataset will improve the accuracy of classification. ! Furthermore, we develop a framework to inform authors on the fly if their review is predicted to be of great use (helpful) to other readers, with the assumption that authors are more likely to rethink their review post and amend it to be of maximum utility to other readers when given some feedback on whether or not it will be found helpful or unhelpful. ! Using past research as a baseline, we find that specialized SVM classifiers outperform higher level models of review helpfulness prediction

Assessing the Threat of Sea Level Rise to Vulnerable Populations in Southeast Florida

Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchiv

Digital Media and Art: Always Already Complicit?

Always Already New: Media, History, and the Data of Culture (Lisa Gitelman) Avatars of Story (Marie-Laure Ryan) Sweet Dreams: Contemporary Art and Complicity (Johanna Drucker

Cerebral damage associated with alcoholism

The neuroanatomical consequences of chronic ethanol ingestion were investigated using neuropsychological tests selectively sensitive to damage in circumscribed brain areas-~~~ The performance of a group of male alcoholics (N=15) with a self-reporte?- drinking history less than ten years, and a group of male alcoholics (N=15) with a self-reported drinking history of ten or more years was compared to a group of male nqnalcoholic controls (N=15). l.A--multiple covariate analysis was done prior to analyzing group differences to determine what influence three covariates (age, education and socioeconomic status) had on the group performances. Results from this analysis indicated that some of the tests were significantly influenced by age or education but no significant Group x Covariate interactions were observed. /JCn agreement with numerous neuropathological findings, the late stage alcoholics were found to be principally deteriorated on the tests of frontal lobe functioning, followed by lesser impairment on the tests of temporal lobe functioning, with no evidence of impairment on the tests of parietal lobe functioning~ No significant group differences were found betv1een the early stage alcoholics and the controls~ Small but negative correlations were found between both the duration of alcoholism and the average amount of alcohol consumed with each of the neuropsychological measures given in this study

Generation Of Oxygen-derived Free Radicals Stimulated By The Fumigant Insecticide Phosphine: In Vivo And In Vitro Studies

Previous studies have shown that phosphine (PH{dollar}\sb3{dollar}) inhibits cytochrome oxidase and that a direct relationship exists between oxygen concentration during fumigation and insect mortality. This study was undertaken to test the hypothesis that mortality is due to cumulative damage of cellular components by free radicals derived from superoxide (O{dollar}\sb2\sp\div){dollar} generated by the inhibited respiratory chain.;Hydrogen peroxide {dollar}\rm(H\sb2O\sb2),{dollar} a product a O{dollar}\sb2\sp\div{dollar} dismutation, was measured spectrophotometrically using yeast cyctochrome c peroxidase as an indicator. The respiratory inhibitors; PH{dollar}\sb3{dollar}, antimycin and myxothiazol stimulated the release of {dollar}\rm H\sb2O\sb2{dollar} from mitochondria isolated from granary weevils (Sitophilus granarius). Peroxide release increased with the addition of {dollar}\alpha{dollar}-glycerophosphate. It was concluded that glycerophosphate dehydrogenase was a source of {dollar}\rm H\sb2O\sb2{dollar}. The concentration of quinone, a major source of {dollar}\rm O\sb2\sp\div{dollar}, was low in granary weevils compared to other species and was unaltered after in vivo PH{dollar}\sb3{dollar}-treatment. Difference spectra, obtained using isolated inhibited mitochondria, provided information about sites of {dollar}\rm O\sb2\sp\div{dollar} generation.;The effect of PH{dollar}\sb3{dollar} on the antioxidant system of PH{dollar}\sb3{dollar}-sensitive (S) and resistant (R) insect was observed. Glutathione was not affected by fumigation (LD{dollar}\sb{lcub}70{rcub}{dollar}). Peroxidase activity, measured using p-phenylenediamine, was the same in S and R insects. After treatment (LD{dollar}\sb{lcub}30{rcub}{dollar}) activity was reduced by 65% in S and 45% in R insects. Catalase activity was significantly higher (62%) in S than R. It was inhibited by 34% in S insects after PH{dollar}\sb3{dollar} treatment (LD{dollar}\sb{lcub}30{rcub}{dollar}) but unaffected in R insects. Superoxide dismutase activity was the same in S and R insects. Two isozymes were present. After fumigation of S insects, activity of the cyanide-sensitive isozyme increased two-fold while the cyanide-insensitive isozyme was not affected. No change was observed in R insects.;Damage to cellular components resulting from attack by oxygen-derived radicals was measured. Polyunsaturated fatty acid content was decreased relative to saturated fatty acid content after S insects were exposed to PH{dollar}\sb3{dollar} in vivo. Sulphydryl group content was also decreased (31%) following fumigation while H+-ATPase activity was increased by 11%. A 30% decrease in ATPase activity was observed after isolated mitochondria were exposed to a free radical-generating system

Take Their Feet off Our Necks: A Descriptive Study of Sexual Harassment in Higher Education

This study examines survivors’ perceptions of sexual harassment experienced as members of higher education (e.g., faculty, staff, students, and administrators). Individually, an examination of the survivors’ perceptions of perpetrator consequences and how institutional responses occurred. This study aims to provide insight into the survivors’ experiences and understandings of sexual harassment experiences, further than the well-established health and career consequences. I utilized the Sexual Harassment in the Academy data set created by Dr. Karen Kelsky. In this study, there is a sample of 1,230 members of higher education who experienced sexual harassment. The sample of self-identified sexual harassment survivors allows the study to focus on how survivors interpret sexual harassment events