Note: The field of functional data analysis is evolving, and new research may have emerged since the knowledge cutoff in September 2021. Consulting recent publications and academic resources on functional data analysis, missing data, and the single index model would provide the most up-to-date information in this area.1
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References
1Kadiri N, Mekki SD, Rabhi A. Single Functional Index Quantile Regression for Functional Data with Missing Data at Random. Ekonometria. 2023;27(3). doi:10.15611/eada.2023.3.01