Giorgio A. Tasca, Christine Cabrera, Elizabeth Kristjansson, Rebecca MacNair-Semands, Anthony S. Joyce, & John S. Ogrodniczuk. (2014). The therapeutic factor inventory-8: Using item response theory to create a brief scale for continuous process monitoring for group psychotherapy. Psychotherapy Research, http://dx.doi.org/10.1080/10503307.2014.963729
The authors report an error in the paper first published online on 8 October 2014: The means and standard deviations of the Therapeutic Factors Inventory-8 scale scores reported in the text on page no. 8 were incorrect. This has now been corrected in both the print and online versions.
The correct text is:
The item means and standard deviations for the TFI-8 scale scores were as follows: At Week 4, M = 4.71, SD = 1.06, n = 312; at Week 8, M = 5.10, SD = 1.02, n = 186; and at Week 12, M = 5.19, SD = 1.17, n = 226.