* Just your name: This is the simplest and most common approach. Your signature is already associated with you and your accomplishments.
* Your name, Ph.D.: This is a perfectly acceptable way to include your degree. For example, if your name is Jane Doe, you could sign "Jane Doe, Ph.D."
* Your name, Ed.D.: If your doctorate is an Education Doctorate (Ed.D.), use this abbreviation instead of Ph.D.
* Your full name, Ph.D.: Some people prefer to sign their full name followed by their credentials.
The best approach depends on your personal preference and the context. If you're signing a formal document, including your credentials might be appropriate. For less formal situations, just your name is fine. Consistency is key—choose a method and stick with it.