Select from Table 4, 18 additional PU's, using a random number following
the last one taken. Recalculate s, S and y, from the final number
after enumeration of the SU's (plots) in the field. If s from 10 PU's
was calculated to be > 27 per cent, m would be > 30. Then only 30
would be taken first and calculation of s made from it, in order to
avoid needlessly exceeding the number of PU's which is required in the
sample.
References
M.H. Hansen, W.N. Hurwitz, Sample Survey Methods and Theory,
W.G. Madow Volume I, Methods and Application,
1953 638 pp.
F. Loetsch, F. Zóhrer and Forest Inventory, Volume II, 469 pp.
K.E. Haller
1973