First: You can’t be good at a skill, but you can have good skills. A skill is something you have, it’s an ability. Second: “Analytical” is an adjective, “analysis” is a noun. Unless you are talking about a particular kind of analysis, then “I have good analytical skills” is what you should say in my opinion. Here are some examples where it makes sense to use “analysis skills”: “Are you exploring a business analyst role and wondering if you have the required business analysis skills and experience?” “Improving your data analysis skills will help you make better decisions for your business.”

"Share your experience" or choose the correct answer?

Analytical skill

I think the phrase "Analytical Skills" is more used