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Interest in online rating data has increased in recent years in which ordinal ratings of products or local businesses are provided by users of a website, such as Yelp! or Amazon. One source of heterogeneity in ratings is that users apply different standards when supplying their ratings; even if two users benefit from a product the same amount, they may translate their benefit into ratings in different ways. In this article we propose an ordinal data model, which we refer to as a multi-rubric model, which treats the criteria used to convert a latent utility into a rating as user-specific random effects, with the distribution of these random effects being modeled nonparametrically. We demonstrate that this approach is capable of accounting for this type of variability in addition to usual sources of heterogeneity due to item quality, user biases, interactions between items and users and the spatial structure of the users and items. We apply the model developed here to publicly available data from the website Yelp! and demonstrate that it produces interpretable clusterings of users according to their rating behavior, in addition to providing better predictions of ratings and better summaries of overall item quality.

Background and objectives Robot-assisted hernia repair, combined with endoscopic component separation, has reduced recurrence and complication rates and allowed immediate intervention in obese patients. We sought to study surgical outcomes in this high-risk group of patients in a community hospital. Methods We conducted a retrospective chart review of ventral, incisional, and umbilical hernia repairs performed at a small community hospital by a single surgeon from March 2014 through November 2016, with statistical analysis of the surgical outcomes. Patients included were those who underwent hernia repair during the study period and had a body mass index (BMI) >30. Patients were followed up for a minimum of 6 months (range, 6-37). Results Forty-seven hernia repairs were performed, including 33 combined and 14 control cases. The demographics of each group were comparable when comparing sex, age, BMI, and ASA classification. Mean follow-up was 19.39 months in the study group and 28.64 months in the control group. There were no significant differences in total operative time, estimated blood loss, conversion rates, or hospital length of stay. Two complications occurred in each of the study and control groups, with no recurrences in the study group and 3 in the control group and no mortalities. Conclusion Robotic laparoscopic repair of abdominal wall defects offers significant advantages, including easier primary defect closure. Our analyses showed that combining robot-assisted hernia repair with mesh and endoscopic component separation is an effective intervention in obese patients.

Waardenburg syndrome (WS) is an inherited autosomal dominant disorder characterized by varying degrees of hearing loss and pigmentary anomalies affecting the eye, hair, skin. It is a rare syndrome affecting about 1 in 42,000 individuals. We herein report a case of WS type I in an 8 day old neonate, which to the best knowledge of the authors is the youngest reported case in literature.