Table 4.

Typing Results for 16 Users on Five Test Strings (Total 31 Words, 145 Characters), Under Six Conditions, with Fixed 600-ms Scan Rate

Scanning condition	Speed (cpm)	Bits per character		Error rate	Long code rate
	M (SD)	M (SD)	opt.	M (SD)	M (SD)
Row/column step scan	22.3 (2.3)	6.2 (0.9)	4.5	2.2 (1.6)	17.5 (9.1)
Row/column auto scan	18.1 (2.2)	5.6 (0.7)	4.5	3.3 (2.7)	10.2 (5.8)
Huffman unigram	14.8 (2.0)	6.0 (0.8)	4.4	2.6 (2.1)	18.2 (7.0)
Huffman 8-gram	27.3 (3.4)	3.1 (0.4)	2.6	2.1 (2.3)	5.8 (4.6)
Linear grid 8-gram	22.6 (1.1)	3.7 (0.2)	3.4	2.0 (1.6)	0.8 (0.9)
RSVP 8-gram	23.7 (2.3)	3.9 (0.5)	3.4	2.8 (2.4)	1.0 (1.0)