M3S2

Department of Mathematics

Question

Q 1

Q 2

Q 3

Statistical Modelling II

Examiner's Comments

The earlier parts were well-answered. The relationship between variance and leverage was

generally not well known. Cook's distance was only rarely used to comment on changes to the

model fit. The lack of symmetry about zero in the residual plot was mentioned by only very few

candidates.

Generally well done, though the calculations with the inverse Gaussian deviance were generally

messier than necessary, as typically the exponential family form of the likelihood was used -

cancellations are more obvious in the form that was given in the paper.

Generally well done - the last past was found difficult, although there were a number of complete

answers. The parametric bootstrap was well-known, although many thought that mean(ds

<0.00001) was a p-value.

Goodness of fit was not really understood, and relatively few candidates picked out useful parts of

the output.

Q 4

Printed: 27/07/2018 11:48:06

M4S2

Department of Mathematics

Question

Q 1

Q 2

Q 3

Statistical Modelling II

Examiner's Comments

The earlier parts were well-answered. The relationship between variance and leverage was

generally not well known. Cook's distance was only rarely used to comment on changes to the

model fit. The lack of symmetry about zero in the residual plot was mentioned by only very few

candidates.

Generally well done, though the calculations with the inverse Gaussian deviance were generally

messier than necessary, as typically the exponential family form of the likelihood was used -

cancellations are more obvious in the form that was given in the paper.

Generally well done - the last past was found difficult, although there were a number of complete

answers. The parametric bootstrap was well-known, although many thought that mean(ds

<0.00001) was a p-value.

Goodness of fit was not really understood, and relatively few candidates picked out useful parts of

the output.

Q 4

Some good understanding was shown. The last parts of the question were not answered well.Q 5

Printed: 27/07/2018 11:48:06

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