Correlation analysis in time series of fruit prices produced in the São Francisco Valley

Authors

Keywords:

Time series, Fruit farming, Detrended fluctuation analysis, Detrended Cross-Correlation Analysis, Detrended Cross-Correlation Coefficient

Abstract

Agribusiness is a significant economic activity in Brazil, representing 26.6% of the GDP in 2020. Fruit farming is a prominent sector, contributing to both the domestic and international markets and generating millions of direct jobs. The total production of fresh fruits in 2020 exceeded 44 million tons, positioning Brazil as the third-largest fruit producer in the world. Among the key fruits, mango and grapes stand out, ranking first and third in exports. This study analyzes the prices of two varieties of mango (Palmer and Tommy Atkins) and two of grapes (Italia and Benitaka) produced in the São Francisco Valley, a region of relevance for these productions and exports. The weekly average price data were obtained from the Center for Advanced Studies in Applied Economics (CEPEA/USP). Using the obtained price series, we calculated logarithmic returns and volatility. We applied the Detrended Fluctuation Analysis (DFA) and Detrended Cross-Correlation Analysis (DCCA) methods, which are useful for identifying the presence of autocorrelation and correlations between two time series simultaneously. The cross-correlation coefficient (ρDCCA) was used to infer the level of cross-correlation. The results indicated higher persistence in the volatility series and two regimes with antipersistence for larger scales in the return series. Cross-correlations suggest that price fluctuations of the leading export variety (Tommy Atkins) have a greater impact on prices in the domestic market (Palmer variety). The cross-correlation coefficient pointed to a stronger correlation between the return series.

References

ANUÁRIO BRASILEIRO DE HORTI & FRUTI 2021. Editora Gazeta, Santa Cruz. 104p., 2021.

BECKMANN, Joscha; CZUDAJ, Robert. Volatility transmission in agricultural futures markets. Economic Modelling, v. 36, p. 541-546, 2014.

CAMARGO, Umberto Almeida. Cultivares para a viticultura tropical no Brasil. Embrapa Uva e Vinho-Artigo em periódico indexado (ALICE), 1998.

CASTILHA, B.; PALMIERI, F.G. UVA/CEPEA: Pedidos externos aumentam no Vale, cenário valoriza uvas no mercado interno. Hortifruti Brasil, 2020. Disponível em: https://www.hfbrasil.org.br/br/uva-cepea-pedidos-externos-aumentam-no-vale.aspx. Acesso em: 15 de dez. de 2021.

CEPEA/ESALQ/USP. Consultas ao Banco de Dados do Site - Centro de Estudos Avançados em Economia Aplicada - CEPEA-Esalq/USP. 2021 Disponível em: https://www.cepea.esalq.usp.br/br/consultas-ao-banco-de-dados-do-site.aspx. Acesso em: 16 de ago. 2021.

CNA; CEPEA. PIB do Agronegócio alcança participação de 26,6% no PIB brasileiro em 2020 PIB do agronegócio. [s.l: s.n.]. Disponível em: https://www.cnabrasil.org.br/assets/arquivos/boletins/sut.pib_dez_2020.9mar2021.pdf . Acesso em 20 out 2021.

DE NICOLA, Francesca; DE PACE, Pierangelo; HERNANDEZ, Manuel A. Co-movement of major energy, agricultural, and food commodity price returns: A time-series assessment. Energy Economics, v. 57, p. 28-41, 2016.

DE OLIVEIRA ARAÚJO, Diogo; MORAES, João Artur Alves; DE CARVALHO, José Luiz Moreira. Fatores determinantes na mudança do padrão de produção e consumo da manga no mercado nacional. Revista em Agronegócio e Meio Ambiente, v. 10, p. 51-73, 2017.

LEÃO, Patrícia Coelho de Souza. Breve histórico da vitivinicultura e a sua evolução na região semiárida brasileira. Anais da Academia Pernambucana de Ciência Agronômica, v. 7, p. 81-85, 2010.

LIMA, Cristiane Rocha Albuquerque et al. Cross-correlations between Brazilian biofuel and food market: Ethanol versus sugar. Physica A: Statistical Mechanics and its Applications, v. 513, p. 687-693, 2019.

LIMA, João Ricardo; SILVA, Juliana de Sales; SANTOS, Ramon K. Barbosa. Comportamento dos preços da manga exportada do Brasil: 2004-2012. Organizações Rurais & Agroindustriais, v. 15, n. 3, 2013.

PAL, Debdatta; MITRA, Subrata K. Interdependence between crude oil and world food prices: A detrended cross correlation analysis. Physica A: Statistical Mechanics and its Applications, v. 492, p. 1032-1044, 2018.

PENG, C.-K. et al. Mosaic organization of DNA nucleotides. Physical review E, v. 49, n. 2, p. 1685, 1994.

PODOBNIK, Boris; STANLEY, H. Eugene. Detrended cross-correlation analysis: a new method for analyzing two nonstationary time series. Physical review letters, v. 100, n. 8, p. 084102, 2008.

ROCHA, Ana Clara; PAGLIUCA, Larissa. No Vale, falta manga e preço continua nas alturas, cotações são as maiores desde 2001. Hortifruti/Cepea, 2016. Disponível em: https://www.hfbrasil.org.br/br/no-vale-falta-manga-e-preco-continua-nas-alturas.aspx. Acesso em: 20 de set. de 2021.

ROCHA, Ana Clara; PAGLIUCA, Larissa. Preços da manga despencam no VSF, oferta nacional está aumentando e demanda segue fraca. Hortifruti/Cepea, 2016. Disponível em: https://www.hfbrasil.org.br/br/precos-da-manga-despencam-no-vsf.aspx. Acesso em: 20 de set. de 2021.

SENAR. Serviço Nacional de Aprendizagem Rural. Fruticultura: colheita, pós colheita e comercialização. Coleção Senar: Brasília. Coleção Senar n 162, 76 p., 2017.

SPESSOTTO, Felipe; GERALDINI, Fernanda. Manga/Cepea: Preços sobem mais de 50% no vale, oferta nacional é baixa. Hortifruti/Cepea, 2020. Disponível em: https://www.hfbrasil.org.br/br/manga-cepea-precos-sobem-mais-de-50-no-vale.aspx. Acesso em 20 de set. de 2021.

ZEBENDE, Gillney Figueira. DCCA cross-correlation coefficient: Quantifying level of cross-correlation. Physica A: Statistical Mechanics and its Applications, v. 390, n. 4, p. 614-618, 2011.

Published

31-12-2023

How to Cite

de Freitas Assunção, B., de Oliveira Nunes, J. E., de Carvalho Barreto, I. D., Stosic, B. ., & Stosic, T. (2023). Correlation analysis in time series of fruit prices produced in the São Francisco Valley. Sigmae, 12(3), 67–81. Retrieved from https://publicacoes.unifal-mg.edu.br/revistas/index.php/sigmae/article/view/2255