Recently, sentiment polarity detection has increased attention to NLP researchers due to the massive availability of customer's opinions or reviews in the online platform. Due to the continued expansion of e-commerce sites, the rate of purchase of various products, including books, are growing enormously among the people. Reader's opinions/reviews affect the buying decision of a customer in most cases. This work introduces a machine learning-based technique to determine sentiment polarities (either positive or negative category) from Bengali book reviews. To assess the effectiveness of the proposed technique, a corpus with 2000 reviews on Bengali books is developed. A comparative analysis with various approaches (such as logistic regression, naive Bayes, SVM, and SGD) also performed by taking into consideration of the unigram, bigram, and trigram features, respectively. Experimental result reveals that the multinomial Naive Bayes with unigram feature outperforms the other techniques with 84% accuracy on the test set.
Urbanization is a global phenomenon. It is taking place at a faster pace in the less developed countries of the world like Bangladesh. The implication of such urbanization are manifested in mass poverty, gross inequality, high unemployment, crowded housing, proliferation of slums and squatters, deterioration in the environmental condition, highly inadequate supply of water, over crowding in schools and hospitals, increase in traffic jams, road accidents, crimes and social tensions. These features are the characteristics of nearly all urban centers of Bangladesh. The study has endeavored to analyze both the factual status and the perceptual pattern of the environmental quality of Chittagong Metropolitan City. The factual data have been collected from various secondary sources; while the perceptual data are based on a questionnaire survey of opinions of 492 respondents at the household level by city ward. Finally, it has been statistically justified by the use of a satisfaction index to know the degree of satisfaction of the respondents and chi-square test to examine the relationship between the income groups and degree of satisfaction. The study of perception residents f the different environmental aspects, show variation of degree of satisfaction by income groups and by groups of environmental features. The expected growth of population in Chittagong city will have adverse impact on the quality of urban environment.
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