FIR-radio correlation (q_FIR) versus redshift for star-forming galaxies. The evolving fit generated via a survival analysis in this work, assuming α = − 0.8 for objects not detected at 1.4 GHz, is shown by the magenta line. The evolution found by Magnelli et al. (2015) using a stacking analysis is shown by the green points and curve. The shaded magenta and green regions show the 1σ uncertainty. The local value of Yun et al. (2001; 2.34 ± 0.01) and associated spread (0.26) are shown by the dashed line and grey shaded area, respectively.