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Table 1 The number of units, total allocation permutations and size of random component that the final design is selected from, partitioned into first and additional blocks

From: Balance algorithm for cluster randomized trials

Units

Allocations

Random element for first block

Random element for additional blocks

  

Number

Percent

Number

Percent

6

20

-

-

7

35%

7

35

-

-

10

29%

8

70

10

29%

18

26%

9

126

18

29%

32

25%

10

252

32

25%

63

25%

11

462

58

25%

100

22%

12

924

100

22%

100

11%

13

1,716

100

12%

100

6%

14

3,432

100

6%

100

3%

15

6,435

100

3%

100

2%

16

12,870

100

2%

100

1%

17

24,310

100

1%

1,000

4%

18

48,620

1,000

4%

1,000

2%

19

92,378

1,000

2%

1,000

1%

20

184,756

1,000

1%

1,000

1%

21

352,716

1,000

1%

1,000

0%

22

705,432

1,000

0%

1,000

0%

23

1,352,078

1,000

0%

1,000

0%

24

2,704,156

1,000

0%

1,000

0%

25

5,200,300

1,000

0%

1,000

0%

26

10,400,600

1,000

0%

1,000

0%

27

20,058,300

1,000

0%

1,000

0%

28

40,116,600

1,000

0%

1,000

0%

29

77,558,760

1,000

0%

1,000

0%

30

155,117,520

1,000

0%

1,000

0%