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Industrial Statistics with Minitab by Xavier Tort-Martorell Llabres, Lluis Marco Almagro, Pere Grima Cintas

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16.4 Web_visits

The file WEB_VISITS.MTW contains the number of daily visits during October and November 2010 to a website which provides information about training activities in the area of quality control. The file is organized as follows:
Column Name Content
C1 C2 C3 Date Day of the week Visits Date Weekday Number of visits
Based on these data, a capability study of the number of daily visits is carried out with the objective to assess, later on, the impact of the actions for promotion which are intended to be performed.
An important piece of information is that on 14 October a press announcement was released on the institution which organizes these activities. Therein, it was indicated that more information could be found on that web page. During the second week of November, from day 11, a booklet was distributed within which it was also said that more information could be found on that web page.

Start carrying out an exploratory data analysis using a time series plot obtained by:

Graph > Time Series Plot: Simple

Simply place ‘Visits’ in Series to obtain:

nc16uf014.eps

A large peak is observed around observation 14 as well as a certain periodicity within the data. The option Brush allows us to identify which day each point corresponds with (Set ID variables: Date; Day of the week was also used).

All valley points correspond to weekends (Saturdays and Sundays). The peak ...

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