A non-parametric method to investigate internal trends in time sequence: A case study of temperature and precipitation
Trend testing is essential for time sequence analysis. However, the existing trend testing methods mainly study the trends of the sequence as a whole, while there is a lack of feasible research tools for the internal trends of the sequence. Therefore, a non-parametric method was proposed to study th...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2024-01-01
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| Series: | Ecological Indicators |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1470160X23015157 |
| _version_ | 1797397582978220032 |
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| author | Hang Yu Maoling Yang Long Wang Yuanfang Chen |
| author_facet | Hang Yu Maoling Yang Long Wang Yuanfang Chen |
| author_sort | Hang Yu |
| collection | DOAJ |
| description | Trend testing is essential for time sequence analysis. However, the existing trend testing methods mainly study the trends of the sequence as a whole, while there is a lack of feasible research tools for the internal trends of the sequence. Therefore, a non-parametric method was proposed to study the overall and internal trends of the sequence using the ideas of set pair, Cox-Stuart, Innovative Trend Analysis Methodology, and Mann-Kendall and applied to temperature and precipitation sequences. The applied study indicated that the overall and internal trends for global temperature were significantly increasing at the confidence level of α = 0.05. For precipitation, the trends (both overall and internal) of Laifeng and Leibo were increasing and decreasing, respectively, and some of the internal trends were significant (α = 0.05); however, the overall and internal trends of Pingbian and Sangzhi were not exactly the same, i.e., the trend of high (low) values in Pingbian (Sangzhi) was different from the other trends of the rest. In general, the method successfully tested not only the overall trends in temperature and precipitation, but also their internal (divided into low, middle, and high values) trends. These results agreed with the linear slope, Sen's slope, Mann-Kendall, and its improved. Therefore, the method can be used for trend analysis of the sequences. |
| first_indexed | 2024-03-09T01:13:11Z |
| format | Article |
| id | doaj.art-efb321948efe49bf82ed9328aef76415 |
| institution | Directory Open Access Journal |
| issn | 1470-160X |
| language | English |
| last_indexed | 2024-03-09T01:13:11Z |
| publishDate | 2024-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Ecological Indicators |
| spelling | doaj.art-efb321948efe49bf82ed9328aef764152023-12-11T04:16:17ZengElsevierEcological Indicators1470-160X2024-01-01158111373A non-parametric method to investigate internal trends in time sequence: A case study of temperature and precipitationHang Yu0Maoling Yang1Long Wang2Yuanfang Chen3College of Hydrology and Water Resources, Hohai University, China; College of Water Conservancy, Yunnan Agricultural University, ChinaSurvey Design Institute of Water Conservancy and Hydropower in Zhaotong, ChinaCollege of Water Conservancy, Yunnan Agricultural University, China; Corresponding author.College of Hydrology and Water Resources, Hohai University, ChinaTrend testing is essential for time sequence analysis. However, the existing trend testing methods mainly study the trends of the sequence as a whole, while there is a lack of feasible research tools for the internal trends of the sequence. Therefore, a non-parametric method was proposed to study the overall and internal trends of the sequence using the ideas of set pair, Cox-Stuart, Innovative Trend Analysis Methodology, and Mann-Kendall and applied to temperature and precipitation sequences. The applied study indicated that the overall and internal trends for global temperature were significantly increasing at the confidence level of α = 0.05. For precipitation, the trends (both overall and internal) of Laifeng and Leibo were increasing and decreasing, respectively, and some of the internal trends were significant (α = 0.05); however, the overall and internal trends of Pingbian and Sangzhi were not exactly the same, i.e., the trend of high (low) values in Pingbian (Sangzhi) was different from the other trends of the rest. In general, the method successfully tested not only the overall trends in temperature and precipitation, but also their internal (divided into low, middle, and high values) trends. These results agreed with the linear slope, Sen's slope, Mann-Kendall, and its improved. Therefore, the method can be used for trend analysis of the sequences.http://www.sciencedirect.com/science/article/pii/S1470160X23015157Trend testOverall trendInternal trendTemperature and precipitation |
| spellingShingle | Hang Yu Maoling Yang Long Wang Yuanfang Chen A non-parametric method to investigate internal trends in time sequence: A case study of temperature and precipitation Ecological Indicators Trend test Overall trend Internal trend Temperature and precipitation |
| title | A non-parametric method to investigate internal trends in time sequence: A case study of temperature and precipitation |
| title_full | A non-parametric method to investigate internal trends in time sequence: A case study of temperature and precipitation |
| title_fullStr | A non-parametric method to investigate internal trends in time sequence: A case study of temperature and precipitation |
| title_full_unstemmed | A non-parametric method to investigate internal trends in time sequence: A case study of temperature and precipitation |
| title_short | A non-parametric method to investigate internal trends in time sequence: A case study of temperature and precipitation |
| title_sort | non parametric method to investigate internal trends in time sequence a case study of temperature and precipitation |
| topic | Trend test Overall trend Internal trend Temperature and precipitation |
| url | http://www.sciencedirect.com/science/article/pii/S1470160X23015157 |
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