In next generation sequencing field, we can easily see the read-depth concept. And I already understand the concept of it. But what is a fold concept?
just look at the below sentence to better explain word 'fold'.
"the average read depth used in the project has increased by 3-fold. At the same time, the number of reads is reduced by 3-fold to yield comparable sequence coverage."
I suppose that fold refers to a measurement of something. Is it right?
I am so puzzled.