Table 6.14 Point Numbers of Inner and Margin Points of All Models.
Figure 6.11 Standard Error in Space for Every Model and Participant.
Figure 6,12 Standard Error in Space , Min., Mean and Max. Values.
Basic data of pass points, comparison points and models (23 pages) will however be available for participants who wish to
perform their own analysis of error. (We will charge them for reproduction cost and postage).
6.2 Statistical tests of comparison points
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The hypothesis no constant errors or x = 0 = y = z was checked with students t -distribution, Test, x = 0- "s . $9 . (Biome- e
trica table 12. and Statistical Methods by George W, Snedecor 1962 Page 74).
Table 6.21
Result. About 20 % of the comparison points in the group of models had constant errors or lacking symmetry around zero.
In the Experiment Reichenbach 1962-1964 there were correspondingly about 75 7o , and in the Experiment Monti di Revóira
1958-1960 no constant errors,
The hypothesis normal distribution was checked according to Biometrica table 34, Table 6.22.
Result, About 60 % of the coordinates were not normally distributed, The error distribution is studied in detail and reported
on in section 8, In the Experiment Reichenbach 1962-1964 also about 60 % of the coordinates were not normally distributed.
e
The hypothesis homogeneous variance was checked with Bartlett’ test. Snedecor. Page 285-289 and Biometrica table 32,
Result, Homogeneous variance was found at the 1 % level.
Cot EE ; 2 2 :
À test with Biometrica table 31 (s mox" S gave the result heterogeneous variance,
min!
The corresponding test in the Experiment Reichenbach 1962-1964 gave the result heterogeneous variance. The Experiment Monti
di Revóira 1958-1960 gave the following result for strip II (Wild RC 5a 11,5/18, film, vertical photographs, 60 % overlap),
homogeneous variance for x and y but not for z.
The hypothesis no correlation between x, y, z in one comparison point was checked with the aid of partial correlation coeffici -
ents, Snedecor Page 429-431 and Biometrica table 13. Table 6.23.
