Table 4. Descriptive statistics of the respondents in the study site for 2010

Variables Mean Std. deviation Xmin Xmax
Age 45.0 ±12.6 23 75
Ethnicity 2.6 ±0.9 1 4
Household size 4.7 ±1.6 2 9
Education level 1.1 ±0.62 0 2
Labor availability 3.4 ±1.6 1.6 8
Land holdings (ha) 7.0 ±14.6 1 142
Gross annual income ($) 4,907 ±696.2 120 45,428
Gross annual income per capita ($) 1,176 ±2006.1 30 11,918
% income from rubber latex 52.2 ±42.9 0 100
% income from rice production 13.3 ±25.2 0 100
% income from non-timber forest products 4 ±1.3 0 100
% income from other sources 20.5 ±3.4 0 100

1US$ = 9,000.00 rupiah (at the time of writing)