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Öğe An alternative approach for multiple comparison problems when there are a large number of groups: ANOM technique(Pakistan Agricultural Scientists Forum, 2018) Mendeş, M.; Yiğit, S.Analysis of Means (ANOM) is a powerful tool for comparing means, variances, proportions and other location and scale measures. This procedure can also be used efficiently as a multiple comparison test especially when there are a large number of groups. A simulation study has been carried out to investigate the performance of ANOM as a multiple comparison approach. Total accuracy value was found at least 60.00% regardless of experimental conditions. ANOM and Tukey procedures have also been compared on a real data set where there are 80 different wheat varieties. It is concluded that the ANOM has a great advantage over Tukey test in terms of determining superior and worse varieties especially when there are more than 10 treatment groups. © 2018, Pakistan Agricultural Scientists Forum. All rights reserved.Öğe Effect of stocking density on deviation from bilateral symmetry and slaughter weight in broilers(2013) Mirtagioglu, H.; Mollao?ullari, A.; Genç, S.; Mendeş, M.The main objective of this study was to investigate the effect of two different stocking densities (11 birds/m2 and 17 birds/m2) on deviation from bilateral symmetry in broiler chickens. For this purpose, the weekly body weight, left and right shank length, shank width, wing length, face width and face length of the same birds were measured on from 7th to 42nd days of age. Repeated measurements analysis of variance was used to investigate the effect of stocking densities and ages (week) on relative asymmetry. Binary logistic regression analysis was used to determine the most important morphological character influencing the deviation from ideal slaughter weight of 1800 g. The overall relative asymmetry mean for shank width was significantly greater in control group (2.42±0.41) than in treatment group (1.87±0.43). The results of binary logistic regression analysis showed that only increase in difference of width in left and right shank caused significant change (p=0.0148) in slaughter weight. In this study, the deviation from the bilateral symmetry was mostly found in fluctuating asymmetry for the measured characters in treatment group (11 birds per m2), and the low fluctuating asymmetry level was generally indicated higher welfare level and lower developmental instability for this group than that of the control group (17 birds per m2). Stocking density can be stated as one of the most important environmental factors which may influence developmental stability, welfare and performance of broilers.Öğe Influence of using alternative means on type-i error rate in the comparison of independent groups(2014) Mirtagio?lu, H.; Yi?it, S.; Mollao?ullari, A.; Genç, S.; Mendeş, M.In this study, the effect of using trimmed, winsorized, and modified means instead of arithmetic mean on type-I error rate was investigated when the assumptions of the one-way ANOVA were not satisfied. Therefore, random numbers were generated by simulation technique from the populations distributed by Normal (0,1), Beta (5,2) and ?2 (3) for 3 and 4 groups. The results of 30 000 simulation trials demonstrated that all the means displayed similar type-I error rates when the variances were homogenous regardless of the distribution shape, sample size and the number of groups. When homogeneity of variances assumption was not satisfied, the most reliable result was obtained by using trimmed mean in terms of keeping the type-I error rate at nominal alpha level and it was followed by modified and winsorized means. The most biased results were obtained when arithmetic mean was used.Öğe Multivariate perspective for investigating relations among some behavioral traits and feed programs(Pakistan Agricultural Scientists Forum, 2018) Yi?it, S.; Mendeş, M.The main objective of this study is to evaluate the effect of different feed restrictions on some behavioral traits of broiler chickens by using a graphical technique namely Multidimensional Scaling Technique. Multidimensional Scaling Technique indicated that the behavioral traits varied based on feed restrictions and observation time of the behaviors. Results of Multidimensional Scaling Technique also showed that the birds in NF group were more active than the birds in the AD and FR groups and this case was more obvious for males. © 2018, Pakistan Agricultural Scientists Forum. All rights reserved.
