$\textit{Loss Factor}$ is the inverse of $\textit{Quality Factor}$ and is the ratio of the $\textit{resistance}$ and modulus of $\textit{reactance}$.
Applicable units are those of quantitykind:LossFactor
http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=31891
Loss Factor is the inverse of Quality Factor and is the ratio of the resistance and modulus of reactance.
$d = \frac{1}{Q}$, where $Q$ is quality factor.