I'm working on a project to forecast volatility and I'm using intraday data (1 min). I want to include exogenous variables to the model that have daily frequency. I was wondering if GARCH-MIDAS can be used for this? The papers I have read on this model use daily price data and the R-package description (mfGARCH) also says

[...] The GARC-HMIDAS model decomposes the conditional variance of (daily) stock returns into a shortand long-term component, where the latter may depend on an exogenous covariate sampled at a lower frequency.



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