İktisat Bölümü

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Nonnormal Regression.I. Skew Distributions
(2001) Islam, M. Qamarul; L. Tiku, Moti; Yildirim, F.
In a linear regression model of the typey¼ Xþe, it is oftenassumed that the random erroreis normally distributed. Innumerous situations, e.g., whenymeasures life times or reac-tion times,etypically has a skew distribution. We considertwo important families of skew distributions, (a) Weibull withsupport IR:ð0,1Þon the real line, and (b) generalised logisticwit hsupport IR:ð 1,1Þ. Since the maximum likelihoodestimators are intractable in these situations, we derivemodified likelihood estimators which have explicit algebraicforms and are, therefore, easy to compute. We show that theseestimators are remarkably efficient, and robust. We develophypothesis testing procedures and give a real life example
Kadınların Yoksulluğu Yaşama Biçimleri : Yapabilirlik Ve Yapabilirlikten Yoksunluk
(2004) Kardam, Filiz; Yüksel, İlknur; Siyaset Bilimi ve Uluslararası İlişkiler
Bu çalışmada düşük sosyo-ekonomik gruptaki kadınların yoksulluğu algılamaları, yoksullukla ilgili tecrübeleri ve yaşam stratejileri Amartya Sen’in ‘yapabilirlik yaklaşımı’ndan yararlanılarak analiz edilmiştir. Makalenin amacı, temel kapasiteleri ve yaşam deneyimleri farklılık gösteren kadınların yoksulluğu yaşama biçimleri arasındaki benzerlik ve farklılıkları ortaya çıkarırken, gelir ve tüketimin yanı sıra maddi olmayan kaynakları ve olanakları da ele almaktır. Çalışmada, Ankara’da düşük gelir grubunda yaşayan 40 kadın ile derinlemesine görüşmeler yapılmıştır. Görüşülen kadınların evleri ve çevreleriyle ilgili gözlemlere ek olarak yoksulluğu önleyici programlara sahip bazı kurumlardan da bilgi edinilmiştir.
Multiple linear regression model under nonnormality
(2004) Islam, M. Qamarul; Tiku, Moti L.
We consider multiple linear regression models under nonnormality. We derive modified maximum likelihood estimators (MMLEs) of the parameters and show that they are efficient and robust. We show that the least squares esimators are considerably less efficient. We compare the efficiencies of the MMLEs and the M estimators for symmetric distributions and show that, for plausible alternatives to an assumed distribution, the former are more efficient. We provide real-life examples.
Citation - Scopus: 0
Private charity and cooperation vs. non-cooperation
(2006) Yazici, M.; Yazıcı, Mehmet; 144084; İktisat
This study analyzes cooperative and non-cooperative outcomes in the context of private charity and compares them on efficiency grounds. Analysis is conducted in a model economy where there are two rich individuals and one poor and the rich care about the well-being of the poor. The results of the analysis suggest that, when making donations to the poor, the rich should get together and act cooperatively instead of behaving independently. Given the fact that there are many donors in reality and therefore it is difficult for them to get together for cooperation, this result implies a role for government to provide a mechanism for cooperation and justifies the support of the governments for charity organizations. © 2006 Asian Network for Scientific Information.
Does the Incomplete Information Matter with Export Quotas?
(2006) Yazıcı, Mehmet; 144084; İktisat
This study investigates whether or not incomplete information matters when the government adopts the export quotas in intervening in the oligopolistic export markets. Incomplete information the government has is about the unit-production cost of the domestic firm. It is shown first that quotas optimal under full information (full-information policy) result in Stackelberg outcome, the best outcome in a non-cooperative setting from the domestic firm`s point of view. When the full-information policy is implemented in the presence of incomplete information, it is found that no cost-type has an incentive to misrepresent itself as the other type. This means that full-information outcome will be achieved with incomplete information. Hence, incomplete information does not matter in the case of export quotas. This result, however, does not carry over to the case of more than one domestic firm.
Citation - Scopus: 4
Inflation and growth: An empirical study for the comparison of the level and the variability effects
(Nova Science Publishers, Inc., 2006) Arin, K.P.; Omay, Tolga; Omay, T.; 19320; Çankaya Meslek Yüksekokulu
This paper analyzes the interaction between the inflation and growth within the Mankiw-Romer-Weil (1992) framework. Our results indicate that the inflation level has a significant negative effect on output in advanced capitalist economies, whereas inflation variability has a negative and significant effect on output in the long-run for all sub-samples. Our results also show that the variability effects are larger in terms of significance. © 2006 Nova Science Publishers, Inc. All rights reserved.
Citation - WoS: 1
Legislation On Ottoman Copyright Law
(Selcuk Univ, inst Turkish Studies, 2007) Çakmak, Diren; Cakmak, Diren; 131918; Siyaset Bilimi ve Uluslararası İlişkiler
In this study the age of copyright law in Turkey is 157 years is determined and, the fact that copyright as a term has entered in our country in the year 1850 with Statute of Encumen-i Danis, the first legal text on copyright is Statute of Copyright dated 1857, Statute of Copyright and Translation dated 1870 is compensatory legal text of Statute of Copyright, the second legal text on copyright is Code of Copyright dated 1910 is determined.
Citation - Scopus: 0
The journal forum: 1954-1960 in Turkey
(Common Ground Research Networks, 2007) Cakmak, D.; Çakmak, Diren; 131918; Siyaset Bilimi ve Uluslararası İlişkiler
In the ten years (1950-1960) of Democrat Party rule in Turkey, intellectuals were obliged to create some alternative centers of power, particularly in view of government's oppressive policies towards the universities and the press. Forum Journal constituted one such center of criticism. Forum's writers -most of whom were educated in the republican regime- opposed the DP's pragmatic approach to politics and wanted to center political life on reason and to eliminate conservative attitudes. Most of the writers were from the Faculty of Political Science in Ankara University. Forum started to be published in April 1954. Forum did not aim at a struggle to acquire political power. Forum had an influence on almost the whole of the Turkish intelligentsia in the years 1954-1960. The institutions and ideas suggested by Forum were realized to a large extent with the Constitution accepted after the military intervention in the year 1960. For example, the establishment of a second chamber of the legislative assmebly -the Senate-, the constitutional court, the state planning organization, autonomous universities, independence of judges, free press, granting rights to strike and collective negotiations to workers, free opposition, the principal of social equality..etc that had all been discussed in the pages of Forum, found place in the Constitution 1961. So it is possible to claim that Forum Journal with its great contribution for the reconsolidation of the democratic regime demonstrated the higly significant role in Turkish political life. Forum writers treated the military intervention in 27 May 1960 as the liberator of Turkish democracy although it caused a temporary break in the democratic regime. This study which is based on the evaluation of Forum Journal will be a serious contribution considering the journal's support in military intervention of 1960 in Turkish political life. © Common Ground, Diren Cakmak, All Rights Reserved.
Citation - WoS: 3
Citation - Scopus: 5
Mahalanobis distance under non-normality
(Taylor & Francis Ltd, 2010) Tiku, Moti L.; Islam, M. Qamarul; Qumsiyeh, Sahar B.
We give a novel estimator of Mahalanobis distance D2 between two non-normal populations. We show that it is enormously more efficient and robust than the traditional estimator based on least squares estimators. We give a test statistic for testing that D2=0 and study its power and robustness properties.
Plant Size, Turnover and Productivity in Malaysian Manufacturing
(2010) Doğan, Ergun; Wong, Koi Nyen; 43080; İktisat
Malaysian manufacturing has an asymmetrical structure: small and medium-sized enterprises dominate in numbers, but contribute relatively little to total output, employment, and exports as compared to their larger counterparts. In light of an increasingly competitive environment arising from globalization, a sound knowledge of turnover patterns within the sector by plant size and its potential impact on aggregate productivity growth is imperative. We find that turnover, particularly of large plants, makes a substantial contribution to overall productivity growth in manufacturing. Hence, from a policy perspective, facilitating turnover might be as important as supporting existing plants in promoting aggregate productivity growth.
Citation - WoS: 13
Citation - Scopus: 13
Multiple linear regression model with stochastic design variables
(Taylor & Francis Ltd, 2010) Islam, M. Qamarul; Tiku, Moti L.
In a simple multiple linear regression model, the design variables have traditionally been assumed to be non-stochastic. In numerous real-life situations, however, they are stochastic and non-normal. Estimators of parameters applicable to such situations are developed. It is shown that these estimators are efficient and robust. A real-life example is given.
Citation - WoS: 2
Citation - Scopus: 1
Impact of exchange rate and customs union on trade balance at commodity level of Turkey with eu (15)
(Routledge Journals, Taylor & Francis Ltd, 2011) Yazici, Mehmet; Yazıcı, Mehmet; Islam, M. Qamarul; 144084; İktisat
This paper investigates the short-run and long-run impact of exchange rate and customs union on the trade balance at commodity-group level of Turkey with EU (15). Bounds testing approach is employed where a new strategy in the model selection phase is odopted ensuring that optimal model is selected from those models satisfying both diagnostics and cointegration. Results indicate that in the short-run exchange rate matters in determination of trade balance of 13 commodity groups out of 21 and customs union in 8 cases. Pattern of response of trade balance to exchange rate does not suggest a J-curve effect in any of cases. As for the long-run effect, neither exchange rate nor customs union has a statistically significant effect on trade balance of any of commodity groups, suggesting that those significant short-run effects don't last into long-run.
Republican citizenship in Turkey: historical development, perceptions and practices
(Routledge Journals, 2011) Kardam, Filiz; Cengiz, Kurtuluş; 199957; Siyaset Bilimi ve Uluslararası İlişkiler
This article, the result of qualitative research conducted in Ankara, aims to depict the republican understanding of citizenship from the behaviour patterns and daily practices of citizens and to show how it diverges from various other forms of citizenship understanding. Republican citizenship-the most dominant and hegemonic understanding of citizenship in Turkey-was constituted in the process of foundation of the Turkish Republic as a nation-state. In Turkey's historical experience, this tradition, which is based on civil responsibilities, could not develop sufficiently in terms of individual rights and democratic values. As reflected in the perceptions and practices of citizens, Turkish society is still not very close to a democratic understanding of citizenship that strongly defends human rights, legitimacy of differences, equality between people as well as embodying responsibilities for the society
Citation - WoS: 0
Supply Response of the Wine Industry In Turkey
(Asia Life Sciences, 2011) Sakarya, Arif Orçun; Sakarya, Arif Orcun; Temiz, Dilek; Temiz, Dilek; 19342; İşletme; Uluslararası Ticaret ve Finansman
Regarding the high wine production potential; the main goal of the study is to discover whether there is a long run relationship between wine production, wine net export and demand and to display the possible contribution of latter variables on wine production in Turkey. Following the wine market overlook; related contribution is analyzed by using annual time series data for the years 1961-2005, the Johansen cointegration test and ordinary least squares method. The empirical findings have shown that, as the wine net export or the wine demand increases, wine production also increases in Turkey. Cointegration test has proved that there is a long run relationship between wine production and the other variables.
Impact of exchange rate and customs uinon on trade balance at commodity level of Turkey with EU (15)
(Juraj Dobrila ,University Pula, 2011) Yazıcı, Mehmet; Islam, M. Qamarul; 144084; İktisat
This paper investigates the short-run and long-run impact of exchange rate and customs union on the trade balance at commodity-group level of Turkey with EU (15). Bounds testing approach is employed where a new strategy in the model selection phase is odopted ensuring that optimal model is selected from those models satisfying both diagnostics and cointegration. Results indicate that in the short-run exchange rate matters in determination of trade balance of 13 commodity groups out of 21 and customs union in 8 cases. Pattern of response of trade balance to exchange rate does not suggest a J-curve effect in any of cases. As for the long-run effect, neither exchange rate nor customs union has a statistically significant effect on trade balance of any of commodity groups, suggesting that those significant short-run effects don't last into long-run
Citation - WoS: 0
Can Term Structure of Interest Rate Predict Inflation and Real Economic Activity: Nonlinear Evidence From Turkey?
(Springer, 2011) Omay, Tolga; Omay, Tolga; 19320; Çankaya Meslek Yüksekokulu
Citation - WoS: 1
Citation - Scopus: 1
Model selection uncertainties and model averaging in autoregressive time series models
(Isoss Publ, 2012) Islam, M. Qamarul; Yazıcı, Mehmet; Yazici, Mehmet; 144084; İktisat
Selecting the correct lag order is necessary in order to avoid model specification errors in autoregressive (AR) time series models. Here we explore the problem of lag order selection in such models. This study provides an in-depth but easy understanding of the model selection mechanism to the practitioners in various fields of applied research. Several interesting findings are reported and through these the pitfalls of the model selection procedures are exposed. In particular, we show that the whole exercise of model selection and subsequent statistical inference invariably depends upon unknown entities, namely the true values of parameters in the model. The model averaging technique is proposed as an alternative to the common practice of model selection and it is shown that, as a result, the properties of post-model-selection estimates substantially improve.
Citation - WoS: 0
Turkish agricultural import and export demand functions: estimates from bounds testing approach
(Routledge Journals, Taylor & Francis Ltd, 2012) Yazici, Mehmet; Yazıcı, Mehmet; 144084; İktisat
This paper estimates the import and export demand functions for Turkish Agriculture based on the annual data for 1970-2003. The bounds testing approach to the cointegration and the error correction modeling is employed. We, however, adopt a new strategy in the model selection phase and select the optimal model from those models that satisfy both diagnostics and cointegration, thus, unlike the previous literature, ensuring that a statistically reliable and cointegrated model is picked up. Results indicate that for the import demand, relative price is a significant determinant in both short-run and long-run, nominal effective exchange rate matters only in the long-run, but domestic income is not at all a significant determinant for Turkish agricultural import demand. As for the export demand, while all determinants affect the export demand significantly in the short-run, given the relatively small share of Turkish agricultural exports within the world agricultural exports, none individually matters in the long-run.
Citation - Scopus: 2
Exchange rate and Turkish agricultural trade balance with EU (15)
(2012) Yazici, M.; Yazıcı, Mehmet; Islam, M.Q.; 144084; İktisat
This paper investigates the short-run and long-run impact of exchange rate on the trade balance of Turkish Agriculture with EU (15) countries. The bounds testing approach to the cointegration and the error correction modeling is employed. A new strategy in the model selection phase is adopted and the optimal model is selected from the set of those models that satisfy both diagnostic tests and cointegration. Thus, unlike the previous literature utilizing this approach, it is ensured that a statistically reliable and cointegrated model is picked up for estimation. Estimation results based on the data for 1988-I to 2008-IV period indicate that in the short-run real exchange rate variable affects agriculture trade balance in trade with EU(15) and depreciation of Turkish Lira improves the trade balance. As for the long-run impact of the exchange rate, depreciation of domestic currency has a statistically significant negative effect on trade balance of agriculture.
Citation - WoS: 11
Citation - Scopus: 12
Transportation-communication capital and economic growth: a vecm analysis for Turkey
(Routledge Journals, Taylor & Francis Ltd, 2012) Eruygur, Aysegul; Kaynak, Muhtesem; Mert, Merter; 114352
This paper analyses the short- and long-term relationships between the transportation-communication capital and the output for Turkey. The study applies a Cobb-Douglas production function under the assumption of constant returns to scale and employs co-integration analysis by estimating a vector error correction model (VECM). As a result of the VECM estimation, one co-integrating relationship is detected. The results based on the impulse response function analysis imply that per labour transportation-communication capital appears both to have been a crucial input in the Turkish productive process and to have had a positive crowding in effect on the per labour non-residential total capital formation. Moreover, the results support the argument that the transportation-communication capital has a lagged impact on economic growth. The long-term accumulated elasticity of output to transportation-communication capital has been found to be 0.59. The long-term accumulated marginal product was also calculated. It implies that a 1 Turkish Lira increase in per labour transportation-communication capital results in a long-term rise of 1.45 Turkish Liras in per labour output. All these findings suggest that transportation-communication capital may be a powerful tool for policy-makers to promote long-term per labour real output growth in Turkey.

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