Investigated the effect of ethnicity on suicide among Japanese, Caucasians & Filipinos. Results support the hypothesis that Japanese had the highest tendency to suicide & Filipinos had the lowest. However, the suicide rates of the 3 groups appeared to approach a common value. While age & sex were highly significant in explaining suicides, magnitude & form of their effects differed between groups. Rate trends for each were the least uniform, e.g. rates seemed to be decreasing for Japanese males.