When the time decay is slow (β is small but non-zero), the items with large initial relevance have long time to attract attention, resulting in high item degree and a broad item degree distribution.
While the cultural differences did not result in the exclusion of content from the broad item pool, the results did suggest that specific content areas should be checked for cultural specificity at each stage of instrument design and validation.
A number of these broad items were rated as difficult or confusing.
For life satisfaction, principal component factor analysis and the Cronbach's alpha coefficient were used to confirm the validity of combining five (conceptually broad) items into one measure.
Component C (vendor costs) comprised the vendor's labor (C1) and material costs, including broad items such as vaccine purchase, the refrigerator for vaccines and supplies.
In addition, instruments have often been limited to a few broad items which require only one or two dimensions of mental health care [ 19].
Evaluation research cost was excluded g: Composed of the vendor's labor and material costs, including broad items such as the refrigerator for vaccines and supplies h: 52%% of the administered doses that were provided by Vaccine-for-children (VFC) for free.
From the healthcare perspective, we only considered direct medical costs while from the societal perspective we considered broader cost items (direct medical, direct non-medical and indirect cost) [ 7].
While at first glance surprising, we suspect this may reflect our using a relatively broad survey item to assess participants' feelings (a simple Likert-style question addressing global anxiety about the simulation experience).
Compared to the broad fatigue item bank of PROMIS (covering e.g. physical and mental fatigue, frequency and severity of fatigue, and the opposite of fatigue, i.e. feeling energetic), the EORTC fatigue item bank is narrower focusing only on severity and intensity of general and physical fatigue.
