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1.2.

. : [Afifi and Elashoff (1966); Hartley and Hocking (1971); Orchard and Woodbury (1972); Dempster, Laird and Rubin (1977); Little (1982)]. () .

1. . - , 1.1, [., , Nie, Hill, Jenkins, Steinbrenner and Bent (1975)]. . 3. . .

2. . . , : () , , , , , . , . 2, 3 4. , , . (. . 12).

3. . , . . .

, , . , . (1)

, , ( ). . , , , , . . 4.

4. , . . , , . , , , ( , , ), . , , . . 512, II .

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