Table 5. Statistical result of model-root size estimation extracted using threshold.

Size of model-root(cm)	1.5	2.2	3
Threshold 40%
Mean Estimated Size(cm)	2.27	2.87	3.72
Mean Absolute Error(cm)	0.82	0.74	0.77
Root mean squared Error(cm)	0.95	0.93	0.96
Standard Deviation(cm)	0.49	0.64	0.65
Standard Error	0.11	0.13	0.12
Threshold 50%
Mean Estimated Size(cm)	2.11	2.63	3.40
Mean Absolute Error(cm)	0.62	0.61	0.59
Root mean squared Error(cm)	0.77	0.75	0.71
Standard Deviation(cm)	0.48	0.63	0.61
Standard Error	0.11	0.12	0.11
Threshold 60%
Mean Estimated Size(cm)	1.90	2.30	3.06
Mean Absolute Error(cm)	0.51	0.44	0.52
Root mean squared Error(cm)	0.59	0.58	0.61
Standard Deviation(cm)	0.45	0.58	0.62
Standard Error	0.10	0.11	0.12