Why are prediction intervals on fitlm NaN

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Albin 2015-10-23

Using

mdl = fitlm(x_mlr,y,'quadratic'); [y,pi] = predict(mdl,x,'Prediction','observation');

results in perfectly fitting model but in a pi matrix containing NaNs only. Any suggestion why this is the case. It works fine for:

mdl = fitlm(x_mlr,y,'linear');

Thank you in advance

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