Best Minitab Tool to determine a Statistically Significant Trend

  • Thread starter DeborahBartlett
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DeborahBartlett

#1
#1
Which tool in Minitab is the best to determine if your data has a statistically significant trend? I thought Run Chart but reading the definition of "trends" (my interpretation which may be off) using just the p-value for trends does not necessarily tell me if there is a statistically significant overall trend. (Key here is "Trends" vs. "Trend"). Is the Run Chart still valid if you use both Trends and Clustering? OR is there a better tool to make that determination? i.e. - looking at 24 months of data do I see a statistically significant upward or downward trend at this time.
 
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Bev D

Bev D

Heretical Statistician
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#3
#3
Control charts is probably the best tool

Can you provide more info on what you are doing? This will help us help you
 
D

DeborahBartlett

#4
#4
Bev D said:
Control charts is probably the best tool

Can you provide more info on what you are doing? This will help us help you
Click to expand...
Thanks for the bump. Bev D. - more info
I am looking at time series data (monthly), for the quantity of calls received in that month. I am looking at run chart (just because it gave actual p-values) but I was also looking at the C-Chart with triggers for over 3 std dev above center line, points above or below center line and point increasing or decreasing. We only want to look at "new" issues/triggers, i.e.- new trends
 
Bev D

Bev D

Heretical Statistician
Leader
Super Moderator
#5
#5
A control chart is definitely the way to go. They are designed for time series data. 'trend charts' with p values on the other hand really aren't; they are simply a weaker analysis method.

It sounds like a c chart is probably the best choice.

if you can post some of your data we can take a look at it and provide somse advice and hints on how best to interpret and set up control limits...
 
D

DeborahBartlett

#6
#6
Bev D said:
A control chart is definitely the way to go. They are designed for time series data. 'trend charts' with p values on the other hand really aren't; they are simply a weaker analysis method.

It sounds like a c chart is probably the best choice.

if you can post some of your data we can take a look at it and provide somse advice and hints on how best to interpret and set up control limits...
Click to expand...
Unfortunately I can't post data but you have confirmed what I was afraid of with Run Charts. Thank you for the affirmation, it really helps.

Thanks to all!
 
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