Hi. I'm using a binary classification with SVM and MLP for financial data. My input data has 21 features so I used dimensionally reduction methods for reducing the dimension of data. Some dimensionally reduction methods like stepwise regression report best features so I will used these features for my classification mode and another methods like PCA transform data to a new space and I use for instance 60% of best reported columns (features). The critical problem is in the phase of using final model. For example I used the financial data of past year and two years ago for today financial position. So now I want use past and today data to prediction next year. My question is here: Should I use PCA for new input data before inserting to my designed classification model? How can I use (For example Principal component analysis) for this data? I must use it like before? (pca(newdata…)) or there is some results from last PCA that I must use in this phase?
Thank you so much for your kind helps.
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