Correction to: Baseline-adjusted proportional odds models for the quantification of treatment effects in trials with ordinal sum score outcomes

Correction to: BMC Med Res Methodol (2020) 20:104

https://doi.org/10.1186/s12874-020-00984-2

Following publication of the original article [1], the authors would like to correct the formula of the Polr model equation in the paragraph under the heading Enhanced proportional odds logistic regression (ePolr).

The formula currently reads:

$$ \mathrm{P}\left({\mathrm{Y}}^{\mathrm{III}}\le {\mathrm{y}}^{\mathrm{III}}\left|x\right.\;\right)=\mathrm{expit}\left(h\left({\mathrm{y}}^{\mathrm{III}}\left|{\mathrm{y}}^0\right.\right)+\beta \cdot x\right)\;\left(\mathrm{Polr}\right) $$

The formula should read:

$$ \mathrm{P}\left({\mathrm{Y}}^{\mathrm{III}}\le {\mathrm{y}}^{\mathrm{III}}\left|x\right.\;\right)=\mathrm{expit}\left(h\left({\mathrm{y}}^{\mathrm{III}}\right)+\beta \cdot x\right)\;\left(\mathrm{Polr}\right) $$

The original article [1] has been corrected.