I think you are confusing the Pearson correlation coefficient (r) with the Coefficient of Determination (RSquare).
From Fit Y by X, Multivariate, AND Graph Builder, I get the same value for r, which is -0.981. I have included the Graph Builder report that shows this in the upper-left of the graph.
![GraphBuilder.JPG GraphBuilder.JPG](https://community.jmp.com/t5/image/serverpage/image-id/23690iA719ED0E5B659FA3/image-dimensions/520x469?v=v2)
If I fit a linear regression line to the data I get an RSquare of 0.962 from both Graph Builder and Fit Y by X.
![FitYbyXRSquare.JPG FitYbyXRSquare.JPG](https://community.jmp.com/t5/image/serverpage/image-id/23691i6618CBF545F68D94/image-size/large?v=v2&px=999)
Graph Builder report for RSquare.
![GBRSquare.JPG GBRSquare.JPG](https://community.jmp.com/t5/image/serverpage/image-id/23692iC1336C76327F2704/image-dimensions/481x449?v=v2)
Dan Obermiller