Francesca Graziano1, Maria Grazia Valsecchi1, Paola Rebora2. 1. BICOCCA BIOINFORMATICS BIOSTATISTICS AND BIOIMAGING CENTRE-B4, School of Medicine and Surgery, University of Milano - Bicocca, Via Cadore 48, 20900, Monza, Italy. 2. BICOCCA BIOINFORMATICS BIOSTATISTICS AND BIOIMAGING CENTRE-B4, School of Medicine and Surgery, University of Milano - Bicocca, Via Cadore 48, 20900, Monza, Italy. paola.rebora@unimib.it.
Correction: BMC Med Res Methodol 21, 93 (2021)https://doi.org/10.1186/s12874-021-01283-0Following publication of the original article [1], the authors noticed the two errors. The first one in the Notation
setting sub-section of the Methods (in the PDF version this is at page 2, second column, lines 9-11).The published version of the phrase is:Let π = P( = 1|X,Δ,Z) being the inclusion probability of subject i for the phase II sample, conditional on being selected at phase I.The correct version is given below:Let π
= P(
= 1|X
,Δ
), with Δ
= I(T
< C
), being the inclusion probability of subject i for the phase II sample, conditional on being selected at phase I.A second error was found in the Phase
II
sample sub-section of the Methods (in the PDF version this is at page 3, first column, paragraph (iv)).The published version of equation is:The correct version is given below:The original article has been updated.