"first hand data" is correct and usable in written English.
You can use it to refer to information that someone experienced or gathered directly. For example, "I conducted interviews with five former employees to get first hand data about how the company operated."
Carefully designed experiments of a single evaporating droplet subject to gas flow have also been conducted to provide the first hand data for model comparison.
The present study was conducted to assess and compare the environmental consequences of recycled aggregates production from C&D waste and waste glass, and natural aggregate production from virgin materials by LCA by using case specific and first hand data.
The social media strategy also helps BARK gather customer product feedback, providing first hand data to better serve customer needs.
Herein we report our first hand data statistics regarding China mainland.
Direct observation is most preferred because it allows first hand data collection in a natural setting as used in prospective cohort studies in Nigeria and Brazil [ 40, 41].
The mission was unable to gather first hand data on the importance of coral reefs to coastal communities in Myanmar, but coral reefs are vital to the livelihoods of millions worldwide and particularly within the Southeast Asian region.
Much of this information is first-hand data which has been uploaded from the original sources.
They did so by gathering first-hand data and inserting it into public media like newspapers, billboards, even television.
The survey provided helpful first-hand data for design and planning on urban energy saving, emission reduction, and for relevant scientific researches.
Based on first-hand data from the project and using an ecological input output table, the embodied energy and CO2 emissions for that building were estimated for its life cycle.
The experimental results reported in this paper provide a well-documented first-hand data for sleeve connections of cold-formed steel sigma sections in terms of moment resistance, rotational stiffness and typical failure modes.
