# Erratum to: Statistical methodology for age-adjustment of the GH-2000 score detecting growth hormone misuse

• The original article was published in BMC Medical Research Methodology 2016 16:147

## Erratum

After publication of the original article , it came to the authors’ attention that there was an error affecting equation (7). A correction to this equation was submitted by the authors during proofing, but was not implemented correctly by the Production team.

The correct version of equation (7) is as follows:

$$\begin{array}{l}\widehat{\beta^{*}}=\frac{\sum_{i=1}^n\left({Y}_i^{*}-\overline{Y*}\right)\left({x}_i-\overline{x}\right)}}{\sum_{i=1}^n{\left({x}_i-\overline{x}\right)}^2}}=\frac{\sum_{i=1}^n\left({Y}_i-\widehat{\beta}{x}_i-\left(\overline{Y}-\widehat{\beta}\overline{x}\right)\right)}\left({x}_i-\overline{x}\right)}{\sum_{i=1}^n{\left({x}_i-\overline{x}\right)}^2}}\\ {}\kern2.5em =\frac{\sum_{i=1}^n\Big({Y}_i-\overline{Y}}\left)\left({x}_i-\overline{x}\right)-\widehat{\beta}\sum_{i=1}^n\Big({x}_i-\overline{x}}\right){}^2}{\sum_{i=1}^n{\left({x}_i-\overline{x}\right)}^2}}\\ {}\kern2.5em =\frac{\sum_{i=1}^n\Big({Y}_i-}\overline{Y}\Big)\left({x}_i-\overline{x}\right)}{\sum_{i=1}^n{\left({x}_i-\overline{x}\right)}^2}}-\widehat{\beta}\frac{\sum_{i=1}^n\Big(}{x}_i-\overline{x}\Big){}^2}{\sum_{i=1}^n{\left({x}_i-\overline{x}\right)}^2}}=0.\end{array}$$
(7)

Equation (7) has also been updated in the original article in order to rectify this publisher’s error.

## Reference

1. 1.

Böhning D, Böhning W, Guha N, Cowan DA, Sönksen PH, Holt RI. Statistical methodology for age-adjustment of the GH-2000 score detecting growth hormone misuse. BMC Med Res Methodol. 2016;16:147. doi:10.1186/s12874-016-0246-8.

## Author information

Correspondence to Dankmar Böhning. 