Sürdürülebilir Kalkınma Amaçları

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Araştırmacılar(2)

• Kumbasaroglu, Hediye
• Sümer, Enver

• ArticleAçık Erişim2026/r/ebyu/10059
  Global Tea Production Forecasting Using ARIMA Models: A Multi-Country Time-Series Analysis (1961–2028)

  Kumbasaroglu, Hediye

  Understanding the long-term dynamics of global tea production is essential for assessing supply stability, climate sensitivity, and producer competitiveness. This study examines annual tea production data for major producing countries—China, India, Kenya, Sri Lanka, Türkiye, Vietnam, and other producer groups—over the period 1961–2023 and provides production forecasts for 2024–2028 using country-specific ARIMA models. Unlike most existing studies focusing on single countries or short-term horizons, this research offers a unified multi-country and long-term comparative framework that integrates time-series forecasting with market concentration indicators. The results reveal pronounced cross-country heterogeneity in production behavior, with China exhibiting strong structural growth, while other producers display more moderate or climate-sensitive patterns. Forecasts suggest a continued increase in global tea production toward 2028, although projections are subject to uncertainty, as reflected by model-based confidence intervals. Overall, the study contributes robust, statistically validated insights to support evidence-based strategies for sustainable tea supply and international market planning. Forecasts suggest a continued increase in global tea production toward 2028, although projections are subject to uncertainty, as reflected by model-based confidence intervals. These forecasts highlight a robust upward trend in global tea supply due to both technological advancements and market expansion.

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• ArticleAçık Erişim2025/r/ebyu/19436
  Analysis of the Factors Affecting Energy Drink Consumption Among University Students: The Case of Erzincan Binali Yıldırım University

  Kumbasaroglu, Hediye

  The aim of this study is to identify the factors influencing energy drink consumption habits among students at Erzincan Binali Yıldırım University. Within the scope of the research, an online survey was administered to 288 university students. The collected data were analyzed using descriptive statistics, frequency analyses, a 5-point Likert scale, and Binary Logistic Regression methods. The mean level of concern regarding health effects among students who consume energy drinks (M = 2.75) was found to be lower than the overall sample average (M = 2.85), suggesting that these students tend to downplay the associated health risks. High agreement levels with statements such as “consumed more in social environments” (M = 2.88) and “consumption increases when with friends” (M = 2.75) indicate a strong influence of social context on consumption behavior. Psychological assessments revealed low levels of concern, suggesting that students perceive energy drinks primarily as a means of improving physiological performance rather than being emotionally driven. According to the Binary Logistic Regression results, factors such as age and family income negatively affect energy drink consumption, whereas variables such as social media use, academic level, and spending amount positively contribute to increased consumption. Additionally, students who prefer alternative beverages in the morning were significantly less likely to consume energy drinks. In conclusion, it is recommended that awareness be raised among students regarding the potential risks of energy drinks, social media advertising be regulated, and healthy beverage alternatives be promoted more effectively.

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• ArticleYalnız künye2024/r/ebyu/19041
  Türkiye`de Muhasebe Eğitiminin Diğer Disiplin Dallarındaki Yeri ve Lisans Düzeyinde Müfredat İncelenmesi

  Ala, Tolga; Kahraman, Tevhit; Sümer, Enver

  Küreselleşme ile iş dünyasında yaşanan bütünleşmenin muhasebe eğitimine yansımaları uluslararası muhasebe eğitim standartları düzeyinde bir nitelik arayışı içerisindedir. Bu çalışmanın amacı muhasebe eğitiminin disiplinlerarası önemi ve yerinin araştırılarak Türkiye’de bulunan üniversitelerdeki işletme ve ekonomi ana bilim dalları dışındaki lisans bölümlerinde muhasebe eğitimi ve ders müfredatlarının içerik bakımından incelenmesi olarak belirlenmiştir. Ülkemizde farklı disiplinlerde lisans düzeyinde verilen muhasebe dersleri, üniversiteler ve fakülteler bazında içerik analizi yöntemi kullanılarak gruplandırılmıştır. Araştırma; eczacılık fakülteleri, hukuk fakülteleri ve işletme mühendisliği bölümlerini içermektedir. Çalışmada incelenen muhasebe dersleri zorunlu, seçmeli ve uygulamalı dersler olarak kategorilere ayrılarak incelenmiştir. Çalışma sonucunda farklı disiplinlerde işletmeciliğin dili olarak kabul edilen muhasebe uygulamalarına ihtiyaç duyulduğu tespit edilmiştir. Her disiplin için verilecek muhasebe eğitim ve müfredatlarının yeniden oluşturulması, her meslek alanının muhasebe uygulamalarının kullanımları doğrultusunda gözden geçirilmesi gerektiği belirlenmiştir.

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• ArticleAçık Erişim2024/r/ebyu/18513
  Global Pistachio Production Forecasts for 2020-2025

  Uzundumlu, Ahmet Semih; Pinar, Veysel; Tosun, Nur E. R. T. E. K.; Kumbasaroglu, Hediye

  Using 59 years of pistachio production data between 1961 and 2019, the production data of the leading countries in the 2020-2025 periods were tried to be predicted with the help of the ARIMA time series model. ARIMA (p, d, q) analysis model has been used by obtaining 59 years of production data from the United Nations Food and Agriculture Organization (FAO). In addition, the data obtained from the Turkish Statistical Institute (TSI), FAO, and the International Trade Centre (ITC) were also used in the comparison of production, export, and import per capita. In the study, the world production data for the period of 2020-2025 were to be estimated with the data between 1961-2019. As a result of the findings obtained, according to the data obtained in the world, Iran, USA, Turkey, China, and Syria, an increase in production is foreseen in all countries and the world where studies are carried out in pistachio production. While the share of the five countries, which are the leaders in Pistachio production between 1961 and 2019, in the total world production is 97.99%, the share of Pistachio production between 2020-2025 in the total production is expected to be 97.51%. While the share of Iran and Syria from these five countries in world production will decrease, the share of the USA, Turkey, and China will increase. The two leading countries in pistachio exports are Iran and the USA. The fact that Germany, which does not influence production, has a significant share in both exports and imports brings to mind the derivative demand situation. Turkey, Iran, and Syria can create a better marketing strategy by reducing imports to Germany and increasing exports to European Union countries.

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• ArticleAçık Erişim2023/r/ebyu/20231
  Erzincan İlindeki Tüketicilerin Tulum Peyniri Tüketim Tercihlerinin İncelenmesi

  Kumbasaroglu, Hediye

  Bu çalışmanın amacı Erzincan’da ikamet eden tüketicilerin coğrafi işaret ile etiketlenmiş olan Erzincan tulum peyniri tüketim tercihlerini etkileyen faktörleri belirlemektir. Araştırmada Erzincan ilinde ikamet eden 271 tüketiciyle yüz-yüze görüşmeler yapılmıştır. Toplanan datalar tanımlayıcı istatistikler ve frekans tablolarının oluşturulmasında kullanılmıştır. Tulum peyniri tüketimini etkileyen faktörler, çok değişkenli lineer regresyon analizi ile tespit edilmiştir. Bağımlı değişken olan tulum peyniri tüketim miktarını, köyde yaşayan tanıdıkların olması, ailenin ortalama geliri, ailenin ortalama aylık harcaması, beyaz peynir tüketim sıklığı, kaşar peynir tüketim sıklığı, beyaz peynir tüketim miktarı, kaşar peynir tüketim miktarı, tulum peynirinin fiyatı, tulum peynirinin salamura olması, tulum peynirinin coğrafi işaretli ürün olması ve tulum peyniri satış noktası gibi parametrelerin etkilediği sonucuna varılmıştır. Oluşturulan modelin, tulum peyniri tüketimindeki değişkenlerin açıklanma oranı %77.50 seviyesinde olup varyans analizi (ANOVA) çözümüne göre anlamlı olduğu belirlenmiştir. Sonuçta tulum peyniri için ürün hakkında bilgilendirici çalışmaların yapılması ve sağlık açısından faydalarının anlatılması ile tüketim miktarının artışına katkı sağlayacağı önerilmektedir

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• ArticleAçık Erişim2021/r/ebyu/20852
  Economic analysis of tomato in Turkey

  Dağdemir, Vedat; Kumbasaroglu, Hediye; Aşkan, Emine

  In this study, ranking first in vegetable production in terms of cultivation area; the tomato, which has an important place with a share of 50% in terms of vegetable exports, in order to be applicable in 2020, producer and consumer prices and marketing margins in Turkey were examined using data from 2019. In the study, it was selected as the time series between 2003- 2019 and the production-consumption, foreign trade, price fluctuations and marketing margin of tomatoes were considered, taking into account the important production amount and yield parameters. In the study, real prices (2019= 100) were primarily calculated based on the current prices of tomatoes. In the second phase, marketing margins were calculated using the current and real prices of tomatoes. In the third phase, producer and consumer chain indexes are calculated based on current prices and compared with annual inflation rates. In the last phase of the study, the supply and demand models of tomatoes were estimated and interpreted statistically. From the comparisons and comments, it was concluded that the pepper producer real price, trend (time), cucumber producer real price, agricultural worker real price variables are effective for tomato supply and tomato consumer real price, national income, cucumber consumer real price and pepper consumer real price variables are effective for tomato demand. In addition, according to the supply and demand function of the tomato, supply elasticity was calculated as 0.041 and demand elasticity as 0.285. This supports the fact that consumers are more sensitive to tomato prices than producers.

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• ArticleAçık Erişim2020/r/ebyu/22159
  Students’ Milk Consumption Patterns at Erzincan Binali Yildirim University

  Kumbasaroglu, Hediye; Kaya, Tugba Erem

  The present study was conducted on 380 students studying at Erzincan Binali Yildirim University, 57.40% of whom are male and 42.60% female related to their consumption behavior of drinking milk. For analysis of the data, complementary statistics and chi-square test were used. The results of the survey suggest that 21.10% of the students regularly consume milk while 78.90% of the students irregularly drink milk. Among the reasons why the students dislike drinking milk are its taste (37.67%) with a high percentage and smell (30.66%) affecting the students? The percentage of those who do not drink milk for allergic reasons is 4.67%. A significant difference was also reported between the reasons for dislike drinking milk and gender (p<0.05). It was found that 27.89 % of the respondents paid attention to the expiry date during shopping and 39.21 % preferred one percent milk. 67.37% of the students reported that they preferred markets for buying milk. It was found that gender, nourishing property, fat level, price and milk consumption patterns in the market played role in the participants’ preference of milk consumption.

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