U-MIDAS
U-MIDAS (Unrestricted MIDAS) is a regression framework designed to handle mixed-frequency data—when explanatory variables arrive at different sampling frequencies (e.g., monthly GDP mixed with daily stock returns). Introduced by Ghysels and colleagues (2007), it eliminates the restrictive lag-structure polynomial constraints of the original MIDAS approach, allowing fuller use of high-frequency information. This flexibility makes it ideal for nowcasting and real-time economic forecasting.
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- Foroni, C., Ghysels, E., & Marcellino, M. (2015). Mixed-frequency vector autoregressive models. International Journal of Forecasting, 31(4), 1051-1070. · DOI 10.1108/s0731-905320130000031007
- Ghysels, E., Santa-Clara, P., & Valkanov, R. (2007). There is a risk-return trade-off after all. Journal of Financial Economics, 76(3), 674-704. · URL
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