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Search Results: 1 - 10 of 424279 matches for " S.K. Sarkar "
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Importance of Assessing the Model Adequacy of Binary Logistic Regression
S.K. Sarkar,Habshah Midi
Journal of Applied Sciences , 2010,
Abstract: Logistic regression is a sophisticated statistical tool for data analysis in both control experimentation and observational studies. The goal of logistic regression is to correctly predict the category of outcome for individual cases using the most parsimonious model. To accomplish this goal, a model is created that includes all predictor variables that are useful in predicting the response variable. The logistic regression model is being used with increasing rate in various fields in data analysis. In spite of such increase, there has been no commensurate increase in the use of commonly available methods for assessing the model adequacy. Failure to address model adequacy may lead to misleading or incorrect inferences. Therefore, the goal of this study is to present an overview of a few easily employed methods for assessing the fit of logistic regression models. The summary measures of goodness-of-fit as Likelihood Ratio Test, Hosmer-Lemeshow goodness-of-fit test, Osius-Rojek large sample approximation test, Stukel test and area under Receiver Operating Characteristic curve indicate that the logistic regression model fits the data quite well. However, recommendations are made for the use of methods for assessing the model adequacy in different aspects before proceed to present the results from a fitted logistic regression model.
Detection of Outliers and Influential Observations in Binary Logistic Regression: An Empirical Study
S.K. Sarkar,Habshah Midi,Sohel Rana
Journal of Applied Sciences , 2011,
Abstract: trengthening the model.
Clinical Meeting : Iadv & L West Bengal
Ghosh S.K,Roy A.K,Sarkar N.K,Sen S
Indian Journal of Dermatology , 1995,
Abstract:
Sero-Prevalence of Mycoplasma gallisepticum Infection of Chickens in Model Breeder Poultry Farms of Bangladesh
S.K. Sarkar,M.B. Rahman,M. Rahman,K.M.R. Amin
International Journal of Poultry Science , 2005,
Abstract: The sero-prevalence of Mycoplasma gallisepticum (MG) infection of chickens in selected Model Breeder Poultry Farms was determined during the period January to May, 2004. To conduct this study a total of 382 sera samples were collected. Rapid Serum Plate Agglutination (SPA) test was performed using commercial MG antigen (Nobilis MG) to detect the presence of antibodies against MG. The over all sero-prevalence of MG infection was 58.90% in the study area. The highest prevalence (62.44 %) of MG infection was found in winter season followed by summer season (53.10%). The result further revealed that the infection was higher (59.94%) in female birds than in male birds (48.57%). It was also demonstrated that the infection was higher (62.80%) in Feni sadar than in Chhagoalnaiya thana (53.45%).
Erysipeloid
Dey S.K,Sarkar A,Gangopadhyay D.N,Chanda M
Indian Journal of Dermatology , 1995,
Abstract: A 27 year old male presented with erysipeloid lesion on the leg without any systemic involvement. The disease is very uncommon and area involved was unusually large. It is reported because of rarity.
Angiolymphoid Hyperplasia With Eosinophilia
Sarkar J.N,Sengupta B.N,Sadhu S.K,Bora H
Indian Journal of Dermatology , 1998,
Abstract: A case of angilymphoid hyperplasia with eosinophilia is being reported for ita€ s rarity.
Leaf Production, Leaf and Culm Dry Matter Yield of Transplant Aman Rice as Affected by Row Arrangement and Tiller Separation
S.K. Paul,M.A.R. Sarkar,M. Ahmed
Asian Journal of Plant Sciences , 2003,
Abstract: Leaf production, leaf and culm dry matter yield of transplant aman rice as affected by row arrangement and tiller separation was investigated in this study. The highest number of leaves hill-1 (44.53, 70 DAT) was produced in single row, when tiller separation was done (41.00, 55 DAT) at 25 days after transplanting (DAT) and intact hills (48.74, 55 DAT). The lowest leaf production hill-1 was recorded in triple row (26.10, 100 DAT), when tiller separation was done at 35 DAT (26.99, 40 DAT) and 2 tillers kept hill-1 (19.88, 40 DAT). The maximum leaf dry matter yield (2.78 t ha-1, 70 DAT) was obtained in triple row which was statistically identical to double row (2.59 t ha-1), while tiller separation was done at 35 DAT (2.47 t ha-1, 85 DAT) and 4 tillers kept hill-1 (2.56 t ha-1, 85 DAT) which was statistically identical to intact hills (2.50 t ha-1, 85 DAT). But the lowest one was recorded in single row (0.47 t ha-1, 25 DAT), where tiller separation was done at 35 DAT (0.53 t ha-1, 25 DAT) and 2 tillers kept hill (0.56 t ha-1, 25 DAT). The maximum culm dry matter yield was recorded in triple row (4.14 t ha-1, 85 DAT), when tiller separation was done at 35 DAT (4.01 t ha-1, 85 DAT) and intact hills (4.10 t ha-1, 85 DAT) which was statistically identical to 4 tillers kept hil-1 (3.97 t ha-1, 85 DAT). But the lowest dry matter of culm was recorded in single row (0.42 t ha-1, 25 DAT); when tiller separation was done at 25 DAT (0.50 t ha-1, 25 DAT) and 2 tillers kept hill-1 (0.49 t ha-1, 25 DAT). Closer row spacing significantly reduced the leaf production ability hill-1 but increase leaf and culm production unit-1 area and hence, dry matter yield increased. To enhance leaf production hill-1, transplant aman rice cv. BR 23 (Dishari) can be grown in single row but to increase dry matter yield it can be grown in triple or double row arrangement. Tillers can be separated at 25 or 35 DAT keeping 4 tillers hill-1.
Effect of Row Arrangement and Nitrogen Level on the Yield and Yield Components of Transplant Aman Rice
D. Dutta,M.A.R. Sarkar,M.A. Samad,S.K. Paul
Journal of Biological Sciences , 2002,
Abstract: The experiment was conducted to investigate the effect of row arrangement and nitrogen level on the yield and yield components of transplant aman rice (cv. BRRI dhan 32). The highest plant height at harvest, number of total tillers hill -1, number of effective tillers hill -1 number of non bearing tillers hill -1, grains panicle -1 and total spikelets panicle -1 were obtained in single row arrangement followed by double, triple and haphazard row system. The maximum grain and straw yield were obtained in double row arrangement. The highest number of effective tillers hill -1, grains panicle -1 and grain yield were found where the crop was fertilized with 120 kg N ha -1. These results were statistically identical when 60 and 90 kg N ha -1 were applied. So, cultivation of transplant aman rice (cv. BRRI Dhan 32) in double row arrangement appeared to be beneficial practice and fertilization with 60 kg N ha -1 was more economic in respect of grain yield.
Development of Washed Cell Fowl Cholera Vaccine in Bangladesh
M.S.I. Akand,K.A. Choudhury,S.M.L. Kabir,S.K. Sarkar
International Journal of Poultry Science , 2004,
Abstract: An experiment was conducted to develop washed cell fowl cholera (WCFC) vaccine with virulent avian Pasteurella multocida (PM 38) serotype 1 (X-73). A total of 20 Fayoumi birds of either sex of 10 weeks aged were divided into two groups as group A (immunized with washed cell fowl cholera vaccine) and group B (unvaccinated control). Primary vaccination was given through IM route in each birds of group A and booster dose was given through SC route after 15 days of primary vaccination. The presence of antibody against P. multocida was determined by slide agglutination test (SAT) and growth inhibition test (GIT). The degree of antibody levels of prevaccination and post vaccination sera were determined by passive haemagglutination assay (PHA). Sera mean PHA titres at 15, 21, 28 and 42 days post-vaccination in group A were 30.4±4.43, 46.4±6.06, 67.2±11.14 and 134.4±22.28 respectively. The present results revealed that WCFC vaccine worked satisfactory in terms of protection rate against Avian Pasteurellosis. It was also demonstrated that experimental WCFC vaccine conferred 80% protection against challenge infection when all chickens of control group failed to survive against challenge infection.
Economic Assessment of Granite Quarrying in Oyo State, Nigeria
S.K. Osasan
Journal of Engineering and Applied Sciences , 2012,
Abstract: For centuries, the mining industry has been contributing to the development of nations, a vibrant mining sector like any other sector provides good platform for a country s growth. Quarrying, a branch of mining is one of the bedrock of the construction sector in any economy. This study examines the economic contribution of granite quarrying in Oyo State, South-Western Nigeria. Fourteen granite quarrying companies exist in the state, out of which twelve are operational. The twelve quarries were visited in the course of this study and relevant data were gathered from them. All the companies share a total of 220.7x106 tons of proven granite reserve. Estimated revenue generated by the federal government is 500,000 day-1. A total of 845 people are directly employed by the quarries, while 1018 people are employed indirectly in the company s community. The study also revealed a substantial increase in the level of income of the indirect employees after relocating to their businesses to the company s community. It was equally discovered that 80% of the granite produced in the state is sold and used in Lagos state (a neighbouring state). Granite quarrying in Oyo state is very profitable and rewarding for investors but government should improve power supply to encourage investors and reduce the cost of operating the quarries.
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