PREDvsDV

From: Mats Karlsson <mats.karlsson@biof.uu.se> Subject: PREDvsDV Date: Mon, 01 Feb 1999 19:42:28 +0100 Dear all, It is customary to use as goodness-of-fit plots PRED (or IPRED) versus DV. Can anyone give a reason to prefer this over DV versus PRED (or IPRED)? It seems to me that the latter is to be preferred (if one wants to make a distinction). The reason is the possibility to add a regression line/smooth in the DV versus PRED plot. For DV versus PRED such a line should be reasonably close to the line of identity, whereas for the PRED versus DV plot such a line has no meaning. Of course there are situations, e.g. with extensive censoring, where also for the DV versus PRED plot a regression line cannot be expected to be close to the line of identity. Best regards, Mats