Table 1. Actual and simulated ethnic proportions in the San Mariano research area (empirical data from 1997 vs. simulated outcomes of batch 2 [batch 20031018_2; n = 103 runs]).    Proportion of ethnicity in research area (%) Ethnicity Origin Main reason for migration Empirical data (1997) Average simulation results (1999) Ilocano Migrated from Ilocos province New land 53 55 Ybanag Cagayan River watershed Land and labor 24 27 Kalinga Inhabited San Mariano before 1900 Local   4   2 Ifugao Ifugao province, Quirino province Land   3   8 Tagalog Southern provinces of Luzon Labor   3   6 Agta Inhabited San Mariano before 1900 Local   1   2 Other   9   0