> There are two reasons. First is that in the "day_of_week", the starting day is
> Friday so if you plot a graph, the left most column will start with Friday.
> You
> may like to start the column with Monday.
Plotting levels in a particular order by default does not usually require an
ordered factor. It only requires that the levels are specified in the desired
plotting order. without ...,ordered=TRUE that does not generate an ordered
factor.
But specifying an ordered factor changes default contrasts in modelling; see
?contrasts for details. That in turn changes the fitted model rather
considerably. It isn't generally sensible to specify ordered factors unless
there really is order that you want to explore.
S Ellison
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