The phrase "valuable observation" is correct and usable in written English.
You can use it to refer to observations that are important or meaningful. For example, "His valuable observation about the effects of climate change was insightful."
"That's an extremely valuable observation," says Clint Chapple, a biochemist at Purdue University in West Lafayette, Indiana.
A data-worth analysis identifies the most valuable observation data to be measured for the best prediction of total hydrocarbon production.
In an e-mail to ScienceInsider, Ian Stirling, a polar bear researcher at the University of Alberta in Canada, calls the 2006 paper a "very valuable observation … properly written up and published in a respected peer reviewed journal".
We find that the most valuable observation data is the cumulative production of heavy oil in the Braun and Burnham model and of light oil in the Wellington model, respectively.
Finally, Stephanopoulos managed a valuable observation about McCain campaign proximity to the accursed Fannie Mae and Freddie Mac: "[Y]our own campaign chairman has taken millions of dollars from Fannie and Freddie Mae and their supporters.
Supporting their hypothesis, they made the valuable observation that IFN-γ expression is associated with a high-grade infiltrate of the SGs, whereas a low-grade infiltrate is instead accompanied by a type-2 response.
A great variety of fishes are kept by aquarium hobbyists, a few of whom make valuable observations on fish behaviour.
While in Calcutta Koch also made valuable observations on the role played by water in the transmission of the bacterium.
He made significant discoveries (especially in Arabia) and made many valuable observations of the peoples he visited; his ready wit enabled him to handle difficult situations.
Such lapses distract attention from the many persuasive and valuable observations Mr. Halper and Mr. Clarke make in this book, showing their own occasional susceptibility to Big Ideas in their efforts to identify the danger of Big Ideas.
Performance study reveals a number of valuable observations.
