Key points are not available for this paper at this time.
Journal Article SAMPLING WITH CONTROL VARIABLES Get access E. C. FIELLER, E. C. FIELLER Search for other works by this author on: Oxford Academic Google Scholar H. O. HARTLEY H. O. HARTLEY Search for other works by this author on: Oxford Academic Google Scholar Biometrika, Volume 41, Issue 3-4, 3 December 1954, Pages 494–501, https://doi.org/10.1093/biomet/41.3-4.494 Published: 03 December 1954
Fieller et al. (Fri,) studied this question.