overall estimates of 45.5% Native American (NA), 40.1% European (EU), 9.8% Asian (AS), and 4.5% African-American (AA) ancestry. Gradients of increasing NA background (37.3% to 51.7%) and of correspondingly decreasing EU ancestry (45.3% to 29.6%) were observed as a function of birth origin from North to South.These estimates are based on only 176 SNPs, so I'm sure they contain at minimum a few percentage points of noise (which shouldn't make a big difference here). As one might expect, among L.A. Hispanics, those born in the US have the highest levels of European ancestry. Guatemalans/Salvadorians have the lowest. Mexicans are intermediate.
An admixture estimate for Los Angeles hispanics
From an open-access paper: