Most recently, Uttl [15], [16] reported that many studies of prospective memory suffer from severe ceiling effects, low statistical power, poor reliability, and poor validity.
Moreover, this meta-analysis demonstrates that previous claims of no age declines in prospective memory are artifacts of methodological and conceptual issues afflicting prior research including widespread ceiling effects, low statistical power, age confounds, and failure to distinguish between various subdomains of prospective memory (e.g., vigilance and prospective memory proper).
The study by Kay [ 29] adopted the 2 PM statistical method, due to the ceiling effects with the use of EQ-5D where 46% of subjects reported full health.
However, the WOMAC score and EQ-5D had a marked ceiling effect, and therefore statistical tests for differences between groups were not performed.
To reach this goal, alternative statistical methods taking into accounted the ceiling effect usually observed in the measures of satisfaction should be explored [ 29].
The questionnaire was pilot-tested by eight intensivists, and preliminary data were analyzed to ensure statistical utility (for example, absence of ceiling and floor effects) and clinical sensibility.
That the index temporarily breached the 13,000 ceiling this week was "certainly a statistical milestone," said Bernard Baumohl, chief global economist at the Economic Outlook Group.
The non-significant statistical tendency is probably caused by the ceiling effect, in which a considerable number of speakers have maximum scores for both conditions, making discrimination between conditions more difficult.
Additionally, assuming that the items are treated as continuous variables, the descriptive statistical analysis was calculated, the floor and ceiling effect was tested, and the discriminatory capacity of the questions and their distribution were studied.
Because of this ceiling effect we refrained from conducting statistical comparisons.
