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How to do trend analysis for the lab tests parameters?


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#1 nagi

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Posted 14 October 2011 - 06:45 PM

How to do trend analysis for the lab. tests parameters such as PH , TDS, COND., OZONE LEVEL Whic is tested every hour during production of bottled water.



#2 mind over matter

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Posted 14 October 2011 - 07:07 PM

How to do trend analysis for the lab. tests parameters such as PH , TDS, COND., OZONE LEVEL Whic is tested every hour during production of bottled water.

Gather data and chart it. The chart will only tell you if you have reason to investigate (e.g. the trend is going up, down or staying the same). It's a matter of investigation, not statistics.

*Edit - Can you post here a spreadsheet of data you have collected?

Edited by mind over matter, 14 October 2011 - 07:20 PM.


#3 MicroMike

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Posted 21 October 2011 - 06:03 PM

1318617922[/url]' post='49256']
How to do trend analysis for the lab. tests parameters such as PH , TDS, COND., OZONE LEVEL Whic is tested every hour during production of bottled water.


The examples here: http://www.safeproduce.eu/Trending.htm are for micro test results, but the general principles are the same for trending any data. You are paying for a lab to test samples and you can get is a lot of valuable info from trending if you choose the right trend method.
HTH Mike

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