Hi,

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. The second reason is
that instead of having all these long factor names (Monday,...), the code
writer has used shorter words (Mon, Tue...).

Regards,

Alok Shende

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