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Gezz's avatar
Gezz
Regular Visitor
4 years ago

Bell Curve using Dax

Hi,   I have a table TTF Raw Data + Formulas Added - with a column called Average Days - I have created a measure for Mean, Median, Standard Deviation and X-3σ and X+3σ - figures below.    Mean =...
lbendlin's avatar
lbendlin
Icon for Super User rankSuper User
4 years ago

You have your six sigma boundaries. First step is to map these out it in a new table ( or data from an existing table.  Curious how you can have negative TTF though )

 

 

Table = GENERATESERIES(-10,120)

 

 

Next you add a calculated column that computes the normal distribution

 

 

ND = NORM.DIST([Value],52.956,19.623,FALSE())

 

 

Last step is to plot it in a line chart or column chart.

 

 

  • Gezz's avatar
    Gezz
    Regular Visitor
    4 years ago

    TTF is average time to fill -5.92 is -3 standard deviations from the mean. It's not an actual data point. 52.95 is mean - 19.62 is standard deviation. 52.92 -3*19.62.

     

     

    I have a column that I have calculated which is =networkdays in the Excel spreadsheet. That gives me my average days for each job. I've then calculated mean, median, standard deviation from that. If there's a way to auto calculate that from dates alone that would help when uploading a new report 

  • Gezz's avatar
    Gezz
    Regular Visitor
    4 years ago

    Hi Inbendlin

     

    Thanks for your help.

     

    I created a table using GENERATESERIES and a Calculated Column. 


    I have a Table with one column from with numbers -5 through to 120 and the another with the distribution values for these figures. The -5 through to 120 are the range in which all of the average days values fall within. I need the distribution values for the unique figures in my Average Days column. 

     

    In below example you have the unique student scores and the distribution for each one - I need to do that with Average Days through DAX.

     

     

     

    I was trying to use DAX to add TFF +  Forumlas Added [Average Days] as another column in the table but wasn't able to. 

     

    Any suggestions?

     

     

    • lbendlin's avatar
      lbendlin
      Icon for Super User rankSuper User
      4 years ago

      It is not clear to me what your expected outcome is. I can not help you without usable sample data. Screenshot are not usable.

      • Gezz's avatar
        Gezz
        Regular Visitor
        4 years ago

        Hi Ibendlin,

         

        I have a column called Averages Days with a series of unique values, e.g 11, 15, 42, 47, 56, 112 etc. I want to plot those with their distribution - so for each value it would be - norm.dist (11, 52.95, 19.62, false) . I would then get a value 0.0011 etc. I could then use the distribution values and the average days value in a histogram to get a skewed bell curve.

        I need one column with all the distribution values and one with all the values from Average Days.

         

        I made a table and need a column that refers to the values listed in the Average Days column which is a separate spreadsheet and then I can do a norm.dist on it I think.