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
RIFF-it good. One day I came to Him, I was so thirsty. I asked for water, my throat was so dry. He gave me water that I have never dreamed of. But for this water, my Lord had to die. He said, I thirst,  yet He made the rivers. He said,