Skip to main content

Correction: Sampling strategies to evaluate the prognostic value of a new biomarker on a time-to-event end-point

The Original Article was published on 30 April 2021

Correction: BMC Med Res Methodol 21, 93 (2021)

https://doi.org/10.1186/s12874-021-01283-0

Following 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 πi = P(\(\xi_i\)  = 1|Xii,Zi) 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 i = P( \(\xi_i\)  = 1|X i i ), with Δ i = I(T i < C i ), 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:

$${\pi}_i=\frac{n/2}{\sum_{i=1}^N{\varDelta}_{\mathrm{i}}}$$

The correct version is given below:

$${\pi}_i=\frac{\sum_{i=1}^N{\varDelta}_i{\xi}_{{i}}}{\sum_{i=1}^N{\varDelta}_{{i}}}$$

The original article has been updated.

Reference

  1. Graziano F, Valsecchi MG, Rebora P. Sampling strategies to evaluate the prognostic value of a new biomarker on a time-to-event end-point. BMC Med Res Methodol. 2021;21:93. https://doi.org/10.1186/s12874-021-01283-0.

    Article  PubMed  PubMed Central  Google Scholar 

Download references

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Paola Rebora.

Rights and permissions

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

Reprints and Permissions

About this article

Verify currency and authenticity via CrossMark

Cite this article

Graziano, F., Valsecchi, M.G. & Rebora, P. Correction: Sampling strategies to evaluate the prognostic value of a new biomarker on a time-to-event end-point. BMC Med Res Methodol 22, 158 (2022). https://doi.org/10.1186/s12874-022-01627-4

Download citation

  • Published:

  • DOI: https://doi.org/10.1186/s12874-022-01627-4