#134 More problems in graph with diary (5) data

closed
gretl gui (36)
5
2010-03-20
2010-02-23
No

With the same data as in the bug before, if I create the 'time' variable and try to show its 'time seris plot' or the time series plot for a linear trend estimated over the 'precio' variable, the trend appears to have little stairs.

Discussion

  • Two graphs with the 'not so linear' trend

     
    Attachments
  • Allin Cottrell
    Allin Cottrell
    2010-02-24

    What would you say the plot of the time trend _should_
    look like, for 5-day data? Do you think it would be
    better to put imaginary "5-day time" on the x-axis rather
    than calendar time? (Clearly, the line is not going to
    be smooth if we use calendar time, as we now do.)

     
  • Allin Cottrell
    Allin Cottrell
    2010-02-24

    • labels: --> gretl gui
    • assigned_to: nobody --> allin
     
  • Based on your comment, I see it is a matter of interpretation.
    It is not really a bug.

    I did not notice that even the time series plot of the 'precio' variable was plotted against 'real time'.

    I think that the user is already making a decission when he organizes the data as diary (5) or diary (7). If the user has 5 observations per week, but (for a reason I don't know) decides to consider the weekends as 'NA', he can do that by selecting diary(7). By contrary if the user has selected diary(5), I think he would like to see in the graphs observation 6 just after observation 5 with no spaces between them. So in response to your question: yes, I think it would be better to put imaginary "5-day time" on the x-axis, because it would be more consistent with the behaviour that a time series analyst is used to see with other periodicity data. But, I have never worked with diary data, so I may be missing something.

    Given that it is not really a bug, I think you can change the status to closed, and If you consider interesting to have a wider consensus about this, please consider to share this question with the gretl-devel or gretl-users list.

     
  • Sven S.
    Sven S.
    2010-03-20

    Following Ignacio's suggestion and closing this.

    thanks,
    sven

     
  • Sven S.
    Sven S.
    2010-03-20

    • status: open --> closed