Endless warning information when doing statistical analysis with covariates regression in DPABI

Submitted by yaqiong on

Hi Chaogan,

Sorry to bother you again. I am really puzzled by the endless warning information when doing statistical analysis with covariates regression in DPABI (as shown below), although you have mentioned it would not affect the results. I am still wondering, is there any solution for this unnecessary and annoying issue? 

Warning: Matrix is singular to working precision.
> In y_regress_ss at 58
  In y_GroupAnalysis_Image at 94
  In y_TTestPaired_Image at 73
  In DPABI_STAT_TOOL>ComputeButton_Callback at 497
  In gui_mainfcn at 96
  In DPABI_STAT_TOOL at 42
  In @(hObject,eventdata)DPABI_STAT_TOOL('ComputeButton_Callback',hObject,eventdata,guidata(hObject))

Looking forward to your reply. Thanks in advance.

Best,

Yaqiong

 

 

 

YAN Chao-Gan

Mon, 11/03/2014 - 14:43

Permalink

Hi Yaqiong,

This sometimes means you have too much covariates thus the cov matrix is rank deficit.

I will check the design matrix, or ignore the warnings.

Best,

Chao-Gan

Forums
DPABI/DPABISurf/DPARSF