Comparison of observational properties of SN 2018bcc with the literature sample of Type Ibn SNe from H17, adapted from their Fig. 12. SN 2018bcc (blue star) and the comparison sample used in this paper are indicated against the rest (gray circles). The results of an unweighted linear regression are shown in gray lines with the given slope and p-value, with the 90% confidence intervals indicated by the shaded regions. A density estimate is overplotted for each scatter plot using contours. Based on these results, SN 2018bcc seems to be a typical member of the fast-evolving subtype. The linear regression uncertainties are calculated from the scatter in the data, ignoring the individual errors. The rise time upper limits are not included in the linear regression, density estimates, or the histogram.