I have high-frequency time series (observations every few minutes) for which I wish to compute daily averages. The data exhibit a strong diel cycle. Sometimes observations are missing in the time ...
I am specifying a sample of weekly work records to be entered into a spreadsheet for an estimation of means on two variables. There are about 250 employees, I am only interested in weeks between a ...
I have conducted a survey in which the questionnaires were sent out to 450 individuals, but only 30% of them answered the questionnaires. Is it still valid to interpret the usual inference analysis ...