topic Re: Project new data to an existing PCA map? in Discussions

Project new data to an existing PCA map?

SustainBeauty — Wed, 09 Oct 2019 17:57:50 GMT

I am wondering whether it is possible to project new data to an existing PCA map. Per my limited knowledge with PCA map generation I do not think it is the case. But want to check with JMP community on this.

The context is that we generated a map using objective data on 20 products with 30 variables. Let's say after an year we want to project data from 3 new products with same 30 variables to the existing PCA map. Is it posisble with PCA approach? Are there any other solutions to achieve this ?

Thanks in adavance for any thoughts and suggetsions.

Re: Project new data to an existing PCA map?

Mark_Bailey — Wed, 09 Oct 2019 18:32:40 GMT

Click the red triangle next to Principal Components and select Save Columns > Save Principal Components. It saves the formula that multiplies the data column by the eigenvectors to obtain the score. It works with new observations.

Re: Project new data to an existing PCA map?

SustainBeauty — Thu, 10 Oct 2019 14:16:58 GMT

Thanks for the reply. So, by doing this does it alter the position of original products and varibales ? or just projects new products into the space?

Re: Project new data to an existing PCA map?

Mark_Bailey — Thu, 10 Oct 2019 15:10:08 GMT

The formulas will project the original data to the same place. The formulas will also project the new data.

Try it.