Thank you Ayelet.
Which pre-processing method is best for powder form? I plan to crush the rice grains into fine powder and use the small items container to collect data. This would allow me to control the consistency of the measurement conditions.
Also, i saw that i need at least 40 samples to make a model. How do people get the meta data for 40 samples? isn’t that a pretty expensive and difficult proposition? They would need lab test reports on all these 40 samples?