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Each SAQ factor requires all items in the factor to be complete, disqualifying all items with one missing value, which explains the disparity in numbers (76 109).
Firstly, if fewer than three days of data were recorded during the seven days immediately preceding each study visit, patient diary entries for morning PEF were substituted in place of the missing value, which raises the possibility of increased variability in PEF measurements.
Missing data: ATD2 and AFP3 had one missing value, which we imputed with the median.
The puzzle is utterly simple to explain: find the missing value, which is denoted by a question mark highlighted in grey.
If Q13 is not considered, only 0.7% of the sample has any missing value, which suggests that the questions are easy to answer, indicating the instrument's high feasibility.
For categorical data, the value that corresponds to a normal healthy condition was used to replace a missing value, which might have introduced some additional bias.
Similar(53)
The assessed missing levels ranged from 10to90%0% of the total observations with missing values which were compatible with those reported in GBS genotype data (e.g., Elshire et al. 2011; Fu and Peterson 2011, 2012; Fu et al. 2014).
The analysis was performed on available data only, and thus no imputations were done for missing values, which were eliminated pairwise.
It is also noteworthy that the dataset is complete with no identified missing values, which again is a particular strength of the study.
Veracity accounts for the correctness of the data, and can include data quality problems such as noise or missing values (which is also referred to as "Big Veracity").
However, the data shows that for origin-destinations combinations at the country level, depending on the commodity type, 15 85% of the observations are missing values (which can best be interpreted as: no trade).
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com