Suicide cases in developed and emerging countries: an analysis using wavelets

Q4 Medicine

Jornal Brasileiro de Psiquiatria Pub Date : 2021-09-01 DOI:10.1590/0047-2085000000341

L. M. Ferreira, Kelly Pereira de Lima, A. R. Morais, T. Sáfadi, J. L. Ferreira

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Abstract

ABSTRACT Objective The aim of this study was to use a wavelet technique to determine whether the number of suicides is similar between developed and emerging countries. Methods Annual data were obtained from World Health Organization (WHO) reports from 1986 to 2015. Discrete nondecimated wavelet transform was used for the analysis, and the Daubechies wavelet function was applied with five-level decomposition. Regarding clustering, energy (variance) was used to analyze the clusters and visualize the clustering process. We constructed a dendrogram using the Mahalanobis distance. The number of groups was set using a specific function in the R program. Results The cluster analysis verified the formation of four groups as follows: Japan, the United States and Brazil were distinct and isolated groups, and other countries (Austria, Belgium, Chile, Israel, Mexico, Italy and the Netherlands) constituted a single group. Conclusion The methods utilized in this paper enabled a detailed verification of countries with similar behaviors despite very distinct socioeconomic, geographic and climate characteristics.

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发达国家和新兴国家的自杀案例:小波分析

摘要目的本研究的目的是使用小波技术来确定发达国家和新兴国家的自杀人数是否相似。方法从世界卫生组织（世界卫生组织）1986年至2015年的报告中获取年度数据。采用离散非抽取小波变换进行分析，并采用Daubechies小波函数进行五级分解。关于聚类，使用能量（方差）来分析聚类并可视化聚类过程。我们使用Mahalanobis距离构建了一个树状图。使用R程序中的特定函数设置组数。结果聚类分析验证了四个群体的形成：日本、美国和巴西是不同和孤立的群体，其他国家（奥地利、比利时、智利、以色列、墨西哥、意大利和荷兰）构成一个单一的群体。结论本文使用的方法能够详细验证具有相似行为的国家，尽管这些国家具有非常明显的社会经济、地理和气候特征。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Jornal Brasileiro de Psiquiatria Medicine-Psychiatry and Mental Health

CiteScore

1.30

自引率

0.00%

发文量

审稿时长

20 weeks

期刊介绍： O Jornal Brasileiro de Psiquiatria se insere em programas de educação continuada e atualização e tem como missão divulgar trabalhos de pesquisa (realizados em instituições brasileiras e estrangeiras) cujos resultados tenham potencial para a investigação e prática clínica no campo da Psiquiatria. Criado em 1938, foi publicado até 1950, sob o título “Anais do Instituto de Psiquiatria”, sem periodicidade regular.