"Artifacts," by Scott G. Ortman

One Surface  Two adjacent Surfaces  Two opposite Surfaces  Three Surfaces  Four Surfaces  
0  count parallel grinding 
3 27.3 18.8 
4 36.4 44.4 
4 36.4 66.7 
11 100.0 21.6  
1  count parallel grinding 
13 56.5 81.3 
5 21.7 55.6 
1 4.3 6.7 
3 13.0 60.0 
1 4.3 16.7 
23 100.0 45.1  
2  count parallel grinding 
14 82.4 93.3 
2 11.8 40.0 
1 5.9 16.7 
17 100.0 33.3  
TOTAL  count parallel grinding 
16 
9 
15 
5 
6 
51  
NOTES: Parallel = percent within number of surfaces parallel to grain of stone; grinding = percent within number of grinding surfaces. 
ChiSquare Tests  
Value  df  2Tailed Significance  
Pearson chisquare  48.403^{a}  8  .000  
Likelihood ratio  55.434  8  .000  
No. of valid cases  51  
^{a} Eleven cells (73.3%) have expected count of less than five. The minimum expected count is 1.08. df = degrees of freedom.  
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