Rank Deficiency Error Minitab

R

reda9

#1
Hi,

Please i got this problem in minitab 16.1.1 :

+ Rank deficiency due to empty cells, unbalanced nesting, collinearity, or an
undeclared covariate. No storage of results or further analysis will be
done.

when i used ANOVA > General linear model

can anyone help me !

Thanks in advance ,
 
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Miner

Forum Moderator
Staff member
Admin
#2
I would have to see how your data file is structured in order to explain. I know the error, and it is always caused by the design structure of the data.
 

Miner

Forum Moderator
Staff member
Admin
#4
Ok, your design structure is unbalanced, and does not appear to be from a designed experiment. Is this historical or observational data rather than from a designed experiment? You can analyze it using regression instead of ANOVA.
 
R

reda9

#5
hi,

Yes these are historical data (random variables), since I work in the field of the soil that can not do an experiment plan designed, so each factor has only one level,

for regression it's work but with different values of R2 (reponse 2),

and i got the same problem with Taguchi method,

any solution please :(
 

Miner

Forum Moderator
Staff member
Admin
#6
No. Since this is historical data, regression is your only option for analysis. All DOE methods for analysis must be pre-planned, designed and ran according to the design in order to use a method such as ANOVA for analysis.
 
#7
Hello,

I have same problem: Anova gives error of :
Rank deficiency due to empty cells, unbalanced nesting, collinearity, or an
undeclared covariate. No storage of results or further analysis will be
done.
What ı have to do ? Could you help me please?
 

Miner

Forum Moderator
Staff member
Admin
#8
Have you read the posts above? If not please do so now. Please post your data and any information necessary to clarify your design.
 
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