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Black hole accretion rate (BHAR), measurement of black hole accretion, is of interest for the supermassive black holes (SMBHs, i.e., for SMBH formation) associated with active galactic nuclei (AGNs). There has been some interest in how this measure relates to a galaxy's star formation rate (SFR), and there is interest in this measure during the early universe for learning the means by which SMBHs grew to the sizes observed: there must have been some type of early very rapid growth, or the ongoing growth must be somewhat greater than has been considered possible (super-Eddington accretion).