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system
why does yahoo finance list the 10y t note (tnx) at 1/10 of cboe and google finance?
user
the cboe states, in an investor's guide to interest rate options: the options’ underlying values   underlying values for the option contracts are   10 times the underlying treasury yields (rates)—   13-week t-bill yield (for irx), 5-year t-note   yield (for fvx), 10-year t-note yield (for tnx)   and 30-year t-bond yield (for tyx). the yahoo! rate listed is the actual treasury yield; the google finance and cboe rates reflect the 10 times value.  i don't think there's a specific advantage to "being contrary", more likely it's a mistake, or just different.
assistant