Analysis is singular. Both words have an “s-i” in them. Analyses is the plural form of analysis, which means there are more than one. In other words, there are several analyses.

Which is correct analysis or analyses?

If you're referring to one study, you use the word “analysis.” But when you're referring to multiple studies, you use the term “analyses.”

What do you mean by analyses?

1a : a detailed examination of anything complex in order to understand its nature or to determine its essential features : a thorough study doing a careful analysis of the problem. b : a statement of such an examination. 2 : separation of a whole into its component parts.