This paper presents the algorithm Polarity Recognizer in Portuguese (PIRPO) to classify sentiment in online reviews. PIRPO was constructed to identify polarity in Portuguese user generated accommodation reviews. Each review is analysed according to concepts from a domain ontology. We decompose the review in sentences in order to assign a polarity to each concept of the ontology in the sentence....

Collaborative filtering plays a crucial role in reducing excessive information in online consuming by suggesting products to customers that fulfil their potential interests. Observing that users’ reviews on their purchases are often in companion with ratings, recent works exploit the review texts in modelling user or item factors and have achieved prominent performance. Although effectiveness o...

The massive and automated access to Web resources through robots has made it essential for Web service providers to make some conclusion about whether the "user" is a human or a robot. A Human Interaction Proof (HIP) like Completely Automated Public Turing test to tell Computers and Humans Apart (CAPTCHA) offers a way to make such a distinction. CAPTCHA is a reverse Turing test used by Web serv...

BACKGROUND Capturing public opinion toward public health topics is important to ensure that services, policy, and research are aligned with the beliefs and priorities of the general public. A number of approaches can be used to capture public opinion. METHODS We are conducting a program of work on the effectiveness and acceptability of health promoting financial incentive interventions. We ha...

a r t i c l e i n f o Keywords: Electronic commerce Online user reviews Risk attitude Willingness-to-pay We develop a two-stage conceptual consumer decision model from the risk perspective to understand the role of online user reviews in consumers' Willingness-To-Pay (WTP). In stage one, consumers assess product uncertainty with product reviews. In stage two, they assess seller uncertainty with...

Latent Dirichlet Allocation (LDA) is a method that can be used to generate word association networks from unstructured text documents. However, no study has yet examined the applicability of LDA for deriving product associations from user-generated content. In this work, we apply LDA on 9,529 unstructured and uncategorized McDonald’s product reviews that were crawled from a German online review...

Gift Giving is a complex and ubiquitous task that would benefit from the simpler and more user-centred style of interaction offered by the Personal Web vision. In this paper we begin by reviewing relevant literature on gift giving, and we identify key roles and requirements of gift giving. We examine current approaches to the support of group gift giving online and review some of their deficien...