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class Post < ActiveRecord::Base end post = Post.new How do I judge whether the 'post' is a new model which is not pulled from the database?
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Gathering evidence to determine model validity is largely accomplished by examining the model structure (i.e., the algorithms and relationships) to see how closely it corresponds to the actual system definition. For models having complex control logic, graphic animation can be used effectively as a validation tool.
If your 'X' value is between 70% and 80%, you've got a good model. If your 'X' value is between 80% and 90%, you have an excellent model. If your 'X' value is between 90% and 100%, it's a probably an overfitting case.
Models are interpretable when humans can readily understand the reasoning behind predictions and decisions made by the model. The more interpretable the models are, the easier it is for someone to comprehend and trust the model.
run model. predict(X_new) where X_new is the new data (as you did with X_test, which essentially was "new" to your model/training) On a different note, I don't see 85% accuracy. The highest seems to be 79.87% and on the test set it seems to be 75.35%. I guess you are the one that has to show the code/data ;).
post.new_record? ActiveRecord's new_record? method returns true if the object hasn't been saved yet.
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