Step 2: Calculation of success rates based on variables of step 1
Calculation (divided by number of results to be marked)	Description	New Variable (for success rates)
( ad2t01 - ad2o01)/4 (number of marked ads – number of marked organic results)/number of ads to be marked on SERP)	Success rate PSM, task A, large screen	ad2sp Thus, “ad2sp” indicates the success rate for “task A, large screen, PSM results”
(ad4o01 - ad4t01)/10	Success rate SEO, task A, large screen	ad4so
(bd2t01 - bd2o01)/4	Success rate PSM, task B, large screen	bd2sp
(bd4o01 - bd4t01)/10	Success rate SEO, task B, large screen	bd4so
(am2t01 - am2o01)/4	Success rate PSM, task A, small screen	am2sp
(am4o01 - am4t01)/10	Success rate SEO, task A, small screen	am4so
(bm2t01 - bm2o01)/4	Success rate PSM, task B, small screen	bm2sp
(bm4o01 - bm4t01)/10	Success rate SEO, task B, small screen	bm4so
((cd2t01 + cd2s01) -(cd2n01 + cd2o01 + cd2w01))/10	Success rate PSM, task C, large screen	cd2sp
((cd4o01 + cd4n01) -(cd4t01 + cd4s01 + cd4w01))/9	Success rate SEO, task C, large screen	cd4so
((dd2t01 + dd2s01) -(dd2n01 + dd2o01 + dd2w01))/10	Success rate PSM, task D, large screen	dd2sp
((dd4o01 + dd4n01) -(dd4t01 + dd4s01 + dd4w01))/9	Success rate SEO, task D, large screen	dd4so
((cm2s01 + cm2t01) -(cm2o01 + cm2n01 + cm2w01))/4	Success rate PSM, task C, small screen	cm2sp
((cm4o01 + cm4n01) -(cm4s01 + cm4t01 + cm4w01))/8	Success rate SEO, task C, small screen	cm4so
((dm2s01 + dm2t01) -(dm2o01 + dm2n01 + dm2w01))/4	Success rate PSM, task D, small screen	dm2sp
((dm4o01 + dm4n01) -(dm4s01 + dm4t01 + dm4w01))/8	Success rate SEO, task D, small screen	dm4so