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In this study, monthly average precipitation data from the Ni\u011fde meteorological station in Turkey covering the period 1950\u20132020 were used. Within the scope of the study, seven different drought index methods were used for drought analysis, and the number and percentages of drought conditions were calculated according to these indices. For example, according to the Standardized Precipitation Index (SPI) method, the proportion of dry periods was determined as 16.2% and the proportion of humid periods as 83.8%. The Mann-Kendall trend analysis performed to determine the drought trends of the region revealed an increasing trend towards humidity in all indices (e.g., z\u2009=\u20091.299,\n                    <jats:italic>p<\/jats:italic>\n                    \u2009=\u20090.194 for SPI). In the study, 60-month drought forecasts covering the years 2020\u20132025 were realized using the Nonlinear Autoregressive Neural Network (NARNN) model, and the results were compared with the Autoregressive (AR) model. In the prediction performance analysis, the NARNN model showed superior prediction performance for all indices with lower RMSE values (e.g., NARNN RMSE\u2009=\u20090.977 for SPI; AR RMSE\u2009=\u20091.704). The prediction performances of different training algorithms and activation functions used in the NARNN model were analyzed. The best performance was obtained with the trainbr training algorithm and sigmoid activation function (e.g., RMSE\u2009=\u20090.997 for SPI). Based on these best parameters, more than 70% of the drought conditions during the 2020\u20132025 period were found to be normal or humid according to NARNN predictions. This study demonstrates the superiority of the NARNN model in nonlinear time series analyses and that it is a reliable tool, especially for future drought forecasts. In addition, comprehensive analyses with different index methods have significantly contributed to understanding the long-term drought trends in the Ni\u011fde region.\u00a0\n                  <\/jats:p>","DOI":"10.1007\/s12145-025-01711-5","type":"journal-article","created":{"date-parts":[[2025,1,20]],"date-time":"2025-01-20T17:27:37Z","timestamp":1737394057000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Determination of the performance of training algorithms and activation functions in meteorological drought index prediction with nonlinear autoregressive neural network"],"prefix":"10.1007","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1361-3423","authenticated-orcid":false,"given":"M\u00fcnevver Gizem","family":"G\u00fcm\u00fc\u015f","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1439-9633","authenticated-orcid":false,"given":"Hasan \u00c7a\u011fatay","family":"\u00c7ift\u00e7i","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3114-8449","authenticated-orcid":false,"given":"Kutalm\u0131\u015f","family":"G\u00fcm\u00fc\u015f","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2025,1,20]]},"reference":[{"key":"1711_CR1","unstructured":"Agrimetsoft (2023) MDM: Meteorological Data Management. 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