Hi @jinkuizhu,
The short answer is that you cannot download all the z-scores at once, but you have two choices to get them:
- If you are looking at a search result in the app when z-scores are currently being shown, then you can download data for your current view by clicking on the download data button at the bottom of the page.
- You can download the normalized values and then calculate them yourself for each probe-set independently as [x-mean(x)]/[stdev(x)], where x is the values for a given gene across all microarray samples.
There are several forum topics (i.e., this one) related to idiosyncrasies of how z-scores are calculated in different situations and personally I’d recommend using the normalized values instead, but if you want z scores, it should be a straightforward and computationally inexpensive calculation.
Best,
Jeremy