Calculates the Durbin-Watson statistic
resids : array-like
Durbin Watson statistic. This is defined as :
sum_(t=2)^(T)((e_t - e_(t-1))^(2))/sum_(t=1)^(T)e_t^(2) :
sm.stats.moment_helpers.mvsk2mnc
sm.stats.stattools.jarque_bera
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