ATAR Notes: Forum

VCE Stuff => VCE Mathematics => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE General & Further Mathematics => Topic started by: Studyinghard on May 08, 2010, 10:08:16 am

Title: 4 point moving average
Post by: Studyinghard on May 08, 2010, 10:08:16 am

When doing a 3 point or 4 moving average of a set of a data you tend to get some values with no numbers. for example.

Sales           71       77         74           69
4 pnt.                          73            72       
Centering                            7.25

Would you include the 71 and 77 in the x values when trying to find the regression line or would you start from 74

so

x      y
74    7.25

etc.

Title: Re: 4 point moving average
Post by: crayolé on May 08, 2010, 05:18:52 pm

You would start from 74.

When smoothing, the points at the start and the end will always be omitted.

And even if you did use 71 and 77, there would be no y values to substitute in