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Articles by Md. Sohel Rana
Total Records ( 3 ) for Md. Sohel Rana
  Md. Sohel Rana , Fahim Hossain and Shuvangkor Shusmoy Roy
  The study contains an empirical research approach on the demand and supply analysis for sugarcane in Bangladesh. Based upon the analysis, how sufficient yield of sugarcane could be achieved as well as sustained in the country is discussed in the study along with exploring its strengths, weakness, opportunities and threat.
  S.M. Raquibul Hasan , Mariam Jamila , Muntasir Mamun Majumder , Raushanara Akter , Md. Mokarram Hossain , Md. Ehsanul Hoque Mazumder , Md. Ashraful Alam , Rumana Jahangir , Md. Sohel Rana , Md. Arif and Shafiqur Rahman
  Problem statement: Mikania scandens (L.) Willd., a medicinal plant, is popularly used as herbal remedy for various ailments in Bangladesh. But the scientific basis for its medicinal use especially in pain and inflammation remains unknown. Therefore, the present study was designed to evaluate analgesic and antioxidant potential of the hydromethanol extract of the leaves of the plant. Approach: The analgesic activity was determined for its central and peripheral pharmacological actions using hotplate and tail immersion method and acetic acid-induced writhing test in mice respectively. The hydromethanol extract was also investigated for its antioxidant action using 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging, Nitric Oxide (NO) scavenging and reducing power assays. Results: The extract, at the dose of 250 and 500 mg kg-1, produced a significant (p<0.05) increase in pain threshold in hotplate and tail immersion methods in a dose dependent manner. In acetic acid-induced writhing test, the extract (500 mg kg-1) produced a maximum of 53.73% inhibition (p<0.001) of writhing reaction compared to the reference drug Diclofenac-Na (76%). A dose dependent scavenging of DPPH radical and NO was observed with good reducing power with the extract. In DPPH radical scavenging assay, the IC50 value of the extract was 375.40 μg mL-1 while the IC50 value for the reference ascorbic acid was 55.89 μg mL-1. The IC50 values of the extract and ascorbic acid were 220.43 and 125.10 μg mL-1, respectively in NO scavenging assay. Conclusion: The findings of the study suggested that the extract from Mikania scandens has strong analgesic and antioxidant effects.
  Md. Sohel Rana , Habshah Midi and A.H.M. Rahmatullah Imon
  Problem statement: The problem of heteroscedasticity occurs in regression analysis for many practical reasons. It is now evident that the heteroscedastic problem affects both the estimation and test procedure of regression analysis, so it is really important to be able to detect this problem for possible remedy. The existence of a few extreme or unusual observations that we often call outliers is a very common feature in data analysis. In this study we have shown how the existence of outliers makes the detection of heteroscedasticity cumbersome. Often outliers occurring in a homoscedastic model make the model heteroscedastic, on the other hand, outliers may distort the diagnostic tools in such a way that we cannot correctly diagnose the heteroscedastic problem in the presence of outliers. Neither of these situations is desirable. Approach: This article introduced a robust test procedure to detect the problem of heteroscedasticity which will be unaffected in the presence of outliers. We have modified one of the most popular and commonly used tests, the Goldfeld-Quandt, by replacing its nonrobust components by robust alternatives. Results: The performance of the newly proposed test is investigated extensively by real data sets and Monte Carlo simulations. The results suggest that the robust version of this test offers substantial improvements over the existing tests. Conclusion/Recommendations: The proposed robust Goldfeld-Quandt test should be employed instead of the existing tests in order to avoid misleading conclusion.
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