((RSSR - [SSR.sub.1] - [SSR.sub.2])/k) / (([SSR.sub.1] + [SSR.sub.2])/(n-2k)),
RSSR = sum of squared residuals from the pooled linear regression
[R'.sub.3] P + RSSR
+ [H.sub.2]O [R'.sub.3] P=O + 2 RSH
, [USSR.sub.1] and [USSR.sub.2] are the restricted sum of squared residuals, unrestricted sum of squared residuals of 1985-1988 subsample and 1989-1992 subsample respectively.
The test statistics are as follows: RSSR
, [USSR.sub.1] and [USSR.sub.2] are the restricted sum of squared residuals, unrestricted sum of squared residuals of 1985-1988 subsample and 19891992 subsample respectively.
One form of the likelihood ratio test is based on the F-ratio(9) F = [(RSSR
- USSR)/q]/[USSR/(n - k)] where RSSR
and USSR are the restricted and unrestricted sum of squared residuals respectively, q is the number of restrictions imposed by the null model on the composite equation, and n - k is the degrees of freedom in the composite equation.
xAuSR [right arrow] [Au.sub.x][(SR).sub.y] + [(x - y)/2] RSSR
As a direct result of the rapid hydrogen atom transfer component of this sequence, the steady-state radical population is dominated by thiyl radicals, and the only important radical-radical termination product is a disulfide (RSSR
2 RSH + Mn[O.sub.2] [right arrow] RSSR
+ MnO + [H.sub.2]0 (1)
2 RSH + [MnO.sub.2] [right arrow] RSSR
+ MnO + [H.sub.2]O