Fig. 1
Person-Item Map of the 12 m-eHEALS scale items in the Rasch Analysis (n = 302). This figure illustrates the distribution of persons’ ability levels (left) and the difficulty levels of items (right) on a continuum measured in logit units. Each “#” =3 persons and each “.” =1 to 2 persons; M = Mean persons’ ability or mean items’ difficulty; S = one standard deviation; T = two standard deviations. The vertical line is a continuum representing the measures of persons’ ability (left side) and items’ difficulty (right side), plotted in logit units. The person’s ability and items’ difficulty increase from the bottom to the top.
