Relationship between Item Responses of Negative Affect Items and the Distribution of the Sum of the Item Scores in the General Population
Fig 1
Item responses of the 16 negative affect items.
The item responses of 16 negative affect items are presented on both normal (A) and log-normal (B) scales. (A) The item response for each of the 16 negative affect items showed a common pattern, which displays different patterns, with a boundary between “rarely” and “occasionally.” (B) The lines for the 16 items crossed each other between “rarely” and “occasionally,” whereas the same lines exhibited a right skewed pattern between “occasionally” and “most.” Using a log-normal scale, the item responses for the 16 items showed a linear pattern between “occasionally” and “most.”