SPC and Global Warming

Quick Links

SPC for Excel Software

Visit our home page

SPC Training

SPC Consulting

Ordering Information

Thanks so much for reading our publication. We hope you find it informative and useful. Happy charting and may the data always support your position.


Dr. Bill McNeese
BPI Consulting, LLC

View Bill McNeese

Connect with Us

Comments (10)

  • ETDecember 30, 2015 Reply

    Hi,have a generaal question about control charts for trending systems… the type you aluded to at teh end of your recent post.In looking at the overall temperature data at teh start of your post, it seems to be following waht coudld be an exponential trend… I woudl be temped to try to find a best fit curve (exponential or whatever it might b) a, then build control limits around it as you did in teh lat section to see if the porces is in ciontrol around that predefined trend…Maybe other "in control" tests could be adaptaed to to fit the trend rather than a constant average (e.g. counts on a positive or negative run, could be changed to counts on a run above or below expected trend)I lack the strong statistical backround you have so my question is, woudl this be an acceptable practice or is there some kind of intinsic statistical flaw in doig this?Thanks,ET

    • billJanuary 4, 2016 Reply

      Thanks for the comment.  I tend to like to keep things simple – and the individuals chart is really very robust.  Of course, you could try to fit the data to different distributions, but there are not really enough data points to get a good idea of what the distribution would be.  All things being equal, if nothing was changing, I would expect the data to some what normal. 

  • Chris LynnDecember 30, 2015 Reply

    Thank you for one of the few climate-change analyses by a non-climate-scientist (as I take you to be) that does not attempt to debunk the incontrovertible fact of global warming by bogus methods like picking 1998 as the baseline year etc. This article clearly shows the progression of warming and the periods of stability – it should be required reading for presidential candidates. You have stayed away – for now – from the discussion of whether the changes are anthropogenic, but I can see a future article on the correlation between temperature and GHG emissions as explicated using SPC.

    • billDecember 30, 2015 Reply

      Hi Chris,
      Thanks for the comment.  As you suspected,  I am not a climate scientist.  Just thought it would be fun to look at the data in a different light.  Control charts are great for telling when a change has occurred – finding out why it changed is much more challenging of course.   

  • Stan AlekmanJanuary 5, 2016 Reply

    Hi Bill, I would like to reproduce fig 1 run chart but I cannot locate the data column in the data sheet. Which column in the data sheet do I use? I do not understand the column headers.Thank you.Stan Alekman

    • billJanuary 6, 2016 Reply

      Hi Stan, If you want the data in degrees C, use column N (the J-D data).  The baseline for the data is 14 degrees.  Divide the number in column N by 100 to get the change in temperature for that year and then add it to 14. 
      I added a column to the workbook with the converted temperatures.  You can redownload it if you would like.

      • Stan AlekmanJanuary 11, 2016 Reply

        Thank you.

  • Susanna GalensApril 26, 2021 Reply

    Mr. McNeese,Would you give me permission to use some of these charts in a class presentation about statistical process control?Thank you,Susanna Galens

    • billApril 27, 2021 Reply

      Hello Susanna, 
      You have my permission.  I would ask you give credit with a link to the website..  Thanks,

  • Susanna GalensApril 28, 2021 Reply

    Thank you so much! Done!

Leave a Reply

Your email address will not be published. Required fields are marked *