MATLAB: How to avoid error in mnrfit line 164

mnrfit

I am getting an error message when I use the mnrfit function on a matrix X and Y like this:
X =
     1   NaN     2
   NaN     3   NaN
   NaN   NaN     4
     6   NaN   NaN
     5   NaN   NaN
Y =
    -1
     1
    -1
     1
    -1
 b=mnrfit(X,Y+2);
Error using mnrfit (line 164)
X and Y must contain at least one valid observation.
I cannot understand why I'm running into such an error…please advise…

Best Answer

The problem is that you have NaNs in every single row of your X matrix.
As the documentation states:
"mnrfit treats NaNs in X and Y as missing data, and removes the corresponding observations."
Every row in your X matrix is an observation on P predictor variables.
Since you have at least one NaN for every observation, all the observations are removed.
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