That arises from inaccurate sampling frame, data clarification or verification methods, reporting or coding of data, and/or specifications. It may also arise from poorly designed survey questionnaires, improper sample allocation and selection procedures, and/or errors in estimation methodology.
riff (rÉªf) n. 1. an ostinato melodic phrase accompanying a soloist in jazz or rock music. 2. any variation or improvisation, as on an idea. v.i. 3. to perform a riff. [1930â35; perhaps alter. of refrain 2] riff Past participle: riffed Gerund: riffing
motif - a design or figure that consists of recurring shapes or colors, as in architecture or decoration. 2. motif - a theme that is repeated or elaborated in a piece of music. 3. motif - a unifying idea that is a recurrent element in literary or artistic work; it was the usual `boy gets girl' theme. theme. idea, thought - the content of cognition; the main thing you are thinking about; it was not a good idea; the thought never entered my mind.