Table 1.

Best-fitting values for internal noise (ι), sample size (ν) and threshold (t) to the data for different observers and conditions (key in second column) along with the log-likelihoods of these fits (column 6). The unit for ι is the proportion of nearest-neighbour spacings in each array. The final column (χ²) shows the values for twice the difference in log-likelihoods of two fits. Fits with a threshold such as row 2 are compared with fits without in the row above. Fits that combine two conditions, such as row 5, which combines 1 and 3, are compared with the summed likelihoods of the two separate fits.

condition		ι	threshold	ν	log-likelihood	χ2
1	M.M. circ rad 1	0.07		5	−940.10
2	M.M. circ rad 2	0.07	0.02	5	−940.15
3	M.M. circ rad rand ang 1	0.09		4	−833.71
4	M.M. circ rad rand ang 2	0.09	0.01		−833.00
5	M.M. 1 and 3 combined	0.07		4	−1785.60	−23.58
6	G.M. circ rad 1	0.06		4	−699.59
7	G.M. circ rad 2	0.06	0.00	5	−699.20
8	G.M. circ rad rand ang 1	0.09		4	−821.34
9	G.M. circ rad rand ang 2	0.09	0.06	6	−821.27
10	G.M. 6 and 8 combined	0.08		4	−1534.80	−27.74
11	M.M. circ ang 1	0.11		5	−1371.30
12	M.M. circ ang 2	0.20	0.38	5	−1371.30
13	M.M. circ ang rand b/w 1	0.15		5	−1895.40
14	M.M. circ ang rand b/w 2	0.15	0.12	5	−1895.30
15	M.M. 11 and 13 combined	0.13		5	−3350.70	−168.00
16	I.M. circ ang 1	0.11		5	−661.30
17	I.M. circ ang 2	0.11	0.08	5	−661.28
18	I.M. circ ang rand b/w 1	0.13		5	−703.17
19	I.M. circ ang rand b/w 2	0.13	0.05	6	−703.17
20	I.M. 16 and 18 combined	0.12		6	−1370.70	−12.46
21	G.M. circ ang 1	0.11		6	−753.02
22	G.M. circ ang 2	0.11	0.08	6	−753.02
23	G.M. circ ang rand b/w 1	0.12		5	−792.96
24	G.M. circ ang rand b/w 2	0.12	0.11	5	−792.84
25	G.M. 21 and 23 combined	0.11		5	−1550.30	−8.64
26	M.M. 11 × 11 1	0.08		6	−1321.80
27	M.M. 11 × 11 2	0.13	0.07	6	−736.40
28	I.M. 11 × 11 1	0.13		11	−736.41
29	I.M. 11 × 11 2	0.13	0.11	11	−736.37
30	M.M. 1 × 11 1	0.07		5	−671.97
31	M.M. 1 × 11 2	0.07	0.00	5	−671.96
32	I.M. 1 × 11 1	0.07		5	1327.10
33	I.M. 1 × 11 2	0.07	0.00	5	1327.10