Error in NMSE = MSE/MSE00 matrix dimensions don't match

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farzad 2015-3-13

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评论： farzad 2015-3-19

Hi all

In case the target and input have multiple rows , meaning , more than one input and target , calculating the MSE , I get one single number , and for MSE00 , I have a 3 *1 matrix , since I have 8 inputs and 3 Targets

how to solve it ?

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Greg Heath 2015-3-13

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编辑：Greg Heath 2015-3-14

Apparently, you used the wrong equation. Both MSE and MSE00 are scalars.

greg MSE00

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farzad 2015-3-15

在 MATLAB Online 中打开

I used these lines and got the results that I have mentioned them besides the parameters, I would like to know if they are reasonable :

 Ntrneq = N*O    %3165
 ynaive = mean(t,2);    % 0.02*ones(O,1)
 Nw00   = numel(ynaive)       %  3
 Ndof00 = Ntrneq-Nw00         %  3162
 y00    = repmat(ynaive,1,N); % [3 1055]
 SSE00  = sse(t-y00)    %  1.2023e+04
 MSE00  = SSE00/Ntrneq        % 3.7988
 MSE00a  = SSE00/Ndof00       %  3.8024              
% MSE00  = mean(var(targets',1))  %  
% MSE00a = mean(var(targets',0))  % 
% LINEAR MODEL y0 = W0*[ones(1,N); inputs];
 W0    = t/[ones(1,N); x];
 Nw0   = numel(W0)               % 27
 Ndof0 = Ntrneq-Nw0              %  3138
 y0    = W0*[ones(1,N); x];
 SSE0  = sse(t-y0)         %  2.9892e+03 isn't this too big ???
 MSE0  = SSE0/Ntrneq             %   0.9445  biased
 MSE0a = SSE0/Ndof0              %   0.9526 DOFa                    
 R20   = 1-MSE0/MSE00            %   0.7514
 R20a  = 1-MSE0a/MSE00a          %   0.7495