Training and testing correlation

User: "Papad"
New Altair Community Member
Updated by Jocelyn
Hello,
When I test a model on known data, as a result I have an accuracy. Is this accuracy always greater than the accuracy I have when I use cross validation where I want to see how my model reacts to unknown data? 
So,  doing the steps in tutorial "Testing a model" , if I have bad accuracy, should I try to find another model or prepare different my data and not go on a cross validation or something else?
Thanks in advance.

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