# Append Predicted Column in CART model **URL:** \ **Category:** KNIME Analytics Platform\ **Created:** [September 17, 2014, 6:06pm UTC](https://forum.knime.com/t/append-predicted-column-in-cart-model/6679 "2014-09-17T18:06:10Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![mauuuuu5](https://forum-cdn.knime.com/user_avatar/forum.knime.com/mauuuuu5/32/351_2.png) [@mauuuuu5](https://forum.knime.com/u/mauuuuu5)\ **Post date:** [September 17, 2014, 6:06pm UTC](https://forum.knime.com/t/append-predicted-column-in-cart-model/6679/1 "2014-09-17T18:06:10Z")
Hello, I am doing a Cart tree and I wonder if there is a way to append the predicted column that appears in the "Decision Tree Predictor" node to the whole base or data before doing the partition.  I want to know because I think that I spend a lot of time applying and formulating the terminal nodes rules in Excel in order to find the predicted bin.   Best Regards         ---
**Author:** ![Aaron\_Hart](https://forum-cdn.knime.com/user_avatar/forum.knime.com/aaron_hart/32/7814_2.png) [@Aaron\_Hart](https://forum.knime.com/u/Aaron_Hart)\ **Post date:** [September 19, 2014, 2:19pm UTC](https://forum.knime.com/t/append-predicted-column-in-cart-model/6679/2 "2014-09-19T14:19:29Z")
I am not quite sure I understand the question.  Would it be possible for you to share an example workflow demonstrating what you are trying to accomplish? Regards, Aaron ---
**Author:** ![mauuuuu5](https://forum-cdn.knime.com/user_avatar/forum.knime.com/mauuuuu5/32/351_2.png) [@mauuuuu5](https://forum.knime.com/u/mauuuuu5)\ **Post date:** [September 21, 2014, 6:03am UTC](https://forum.knime.com/t/append-predicted-column-in-cart-model/6679/3 "2014-09-21T06:03:01Z")
Hi Aaron please find attached the example workflow Regards     - [forum.zip](https://www.knime.com/sites/default/files/forum.zip) ---
**Author:** ![Aaron\_Hart](https://forum-cdn.knime.com/user_avatar/forum.knime.com/aaron_hart/32/7814_2.png) [@Aaron\_Hart](https://forum.knime.com/u/Aaron_Hart)\ **Post date:** [September 22, 2014, 11:05am UTC](https://forum.knime.com/t/append-predicted-column-in-cart-model/6679/4 "2014-09-22T11:05:00Z")
If I understand correctly, you can simply re-use the model output port with a new predictor node to evaluate all of your data with the model.  It is also possible to write the decision tree itself into a file and re-use it in another application, or even just a different workflow.  Attached you will find some examples of this.  I would caution you though to be careful when using a model on the same data that you used to build it.  The fit may be better than you can expect in production as the model could be over-fit to the training data (if it is not a general solution). If evaulating the quality of your model is your concern at this point, I would look to cross validation.  This will let you re-run your model building process several times with the same settings to get a better idea for the stability of your model.  An example of this is also included.  Regards, Aaron - [model\_scoring.zip](https://www.knime.com/sites/default/files/model_scoring.zip) ---
**Author:** ![mauuuuu5](https://forum-cdn.knime.com/user_avatar/forum.knime.com/mauuuuu5/32/351_2.png) [@mauuuuu5](https://forum.knime.com/u/mauuuuu5)\ **Post date:** [September 25, 2014, 9:23pm UTC](https://forum.knime.com/t/append-predicted-column-in-cart-model/6679/5 "2014-09-25T21:23:18Z")
Thank you Aaron ---
**Author:** ![system](https://forum-cdn.knime.com/uploads/default/original/1X/ab3ccf34482a0329361734a18199390177204f15.png) [@system](https://forum.knime.com/u/system)\ **Post date:** [April 16, 2021, 2:23pm UTC](https://forum.knime.com/t/append-predicted-column-in-cart-model/6679/6 "2021-04-16T14:23:05Z")
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