Items or persons located in the pink area on the right perform too erratically to fit the Rasch model.
|
|
Items or persons located in the pink area on the right perform too erratically to fit the Rasch model.
|
|
Items or persons located in the pink area on the right perform too erratically to fit the Rasch model.
|
Items or persons located in the pink area on the left perform too predictably and overfit the Rasch model.
|
The logit scale is an interval scale, in which all logit units have the same value.
|
|
The logit scale is an interval scale, in which all logit units have the same value.
|
Acceptable fit values (white zone) fall between -2.0 and + 2.0 on a standardized t scale. |
|
Acceptable fit values (white zone) fall between -2.0 and + 2.0 on a standardized t scale. |
|
Acceptable fit values (white zone) fall between -2.0 and + 2.0 on a standardized t scale. |
|
Acceptable fit values (white zone) fall between -2.0 and + 2.0 on a standardized t scale. |
Vertical location shows person ability estimate; size represents measurement error.
|
|
Vertical location shows person ability estimate; size represents measurement error.
|
Vertical location shows item difficulty estimate; size represents measurement error.
|
|
Vertical location shows item difficulty estimate; size represents measurement error.
|
|
Vertical location shows person ability estimate; size represents measurement error.
|
|
Vertical location shows item difficulty estimate; size represents measurement error.
|
|
Vertical location shows person ability estimate; size represents measurement error.
|
