x=0.0 mean=0.000 within=0.04000 between=0.00000 total_sd=0.200
x=0.5 mean=0.500 within=0.04000 between=0.00667 total_sd=0.216
x=2.0 mean=2.000 within=0.04000 between=0.10667 total_sd=0.383
Shared-bias counterexample:
x=0.5 error=0.125 disagreement=0.000
x=2.0 error=2.000 disagreement=0.000
Mixture second-moment checks: passed
