  There have been recent claims (Anderson et al., EPL, 110, 10002) of a 5.9
year periodicity in measurements of Newton's gravitational constant, $G$, which
show a very strong correlation with observed periodic variations in the length
of the day. I have used Bayesian model comparison to test this claim compared
to other hypotheses that could explain the variation in the $G$ measurements. I
have used the data from the initial claim, and from an updated set of compiled
$G$ measurements that more accurately reflect the experimental dates, and find
that a model containing an additional unknown Gaussian noise component is
hugely favoured, by factors of $\gtrsim e^{30}$, over two models allowing for a
sinusoidal component.
