TY - JOUR T1 - From the authors: JF - European Respiratory Journal JO - Eur Respir J SP - 1297 LP - 1297 DO - 10.1183/09031936.00179610 VL - 37 IS - 5 AU - M.A. Puhan AU - D. Chandra AU - R.A. Wise AU - F. Sciurba Y1 - 2011/05/01 UR - http://erj.ersjournals.com/content/37/5/1297.abstract N2 - From the authors:J.W. Dodd and P. Jones argue that anchor-based approaches may lead to unreliable estimates of the minimal important difference (MID) because of measurement error. Using simulated data, they show that MID estimates may vary considerably even if there is a strong correlation between the anchor measures and the outcome of interest (6-min walk distance in our study). Thereby, they illustrate the properties of the correlation coefficient, which does not change if one swaps the x and y variable, and of the fitting line, which changes depending on whether x … ER -