The Department of Statistics and Data Science at Yale University offers three types of positions which are categorized:

Research assistantships, teaching assistantships, and teaching fellowships.

Let's get to see every single detail it provides us such as tuition, fees and requirements. 

• Research Assistantship: Research Assistant (RA) positions at our institution come with a monthly salary, the amount of which is determined by the respective department and Graduate School. Engaging in RA responsibilities not only provides financial support but also aligns with the requirements for your academic degree. The work undertaken as an RA contributes significantly to both your thesis and ongoing faculty research initiatives. Additionally, RA positions may cover a substantial portion of your tuition fees—typically 50%, and in some cases, the entire tuition fee may be covered, contingent upon the acquisition of a fellowship. This comprehensive support structure ensures that RAs can pursue their academic endeavors with financial assistance while actively contributing to the scholarly pursuits of the department and faculty.
• Teaching Assistant (TA): This position is mostly about helping with teaching-related tasks, such as grading assignments, leading discussion sections, or helping with course preparation.
• Teaching Fellowship (TF): This is another teaching-related position, but it might lead to more responsibilities than a TA, like leading classes or creating course materials.
• Project Assistant (PA): PAs work on projects that don't have much to do with their degree. They work up to ten hours a week and are paid based on a rate approved by the department.

Combining Positions: After the approval of the director of graduate studies and the relevant associate dean, It's possible for a student to hold both a project assistant and a research assistant position. 

There are three positions available in the master's program in Data Science which are Research Assistantship, Teaching Assistantship, and Teaching Fellowship. Research Assistantship provides a monthly salary, fulfils degree requirements, and covers either CRF or 50% of tuition, with the possibility of additional fellowship support. Project Assistant positions are available for unrelated projects with a limited weekly work limit and pay based on approved rates. Students may hold both Project Assistant and Research Assistant positions with approval. State residency eligibility is not mentioned in the text.

Here we have diversified information about funding opportunities for PhD students at Yale University, including stipends, fellowships, and health coverage.

• Ph.D. students at Yale get money for a minimum of five years, they receive a twelve-month stipend for living expenses and a fellowship covering full tuition costs.
• Funding sources might differ during a student's enrollment, with details managed by the program and the Graduate School.
• For a doctoral program, the University Fellowships (UFs) from the Graduate School may be used for stipend and tuition expenses in the initial years. 

In the beginning, stipends are often funded through teaching fellowships, dissertation fellowships, or research assistantships.

• PhD students while reaching Yale might receive a Teaching Fellowship.  
• Instead of a teaching fellowship, students can go for Professional Development Opportunities. 
• PhD students of Humanities and social sciences may be eligible for a Sixth-Year Funding Initiative.
• External funding is encouraged and may offer flexibility in the program, such as deferring a University Fellowship (UF) or University Dissertation Fellowship (UDF).
• Students need to inform the Graduate School if they receive any external awards. 

Additional fellowships, stipend supplements, conference travel funding, and research support may be offered by some programs and departments.

Health Fellowship Awards cover Yale Health Hospitalization Specialty Care Coverage for Ph.D. students and their dependents. There are Special fellowships that cover your health costs, including hospitalization and prescription drugs for Ph.D. research requiring international travel.

Funding is available for conference travel through various sources, including the Graduate Student Assembly (GSA).

Specific fellowships are mentioned here such as:

• The John Morton Blum Fellowship for Graduate Research in American History
• The Yale Club of San Francisco Summer Research Grant.

In conclusion, Ph.D. students at Yale receive comprehensive funding, including stipends and fellowships. Funding sources vary over the course of their enrollment, and external awards are encouraged. Health coverage and support for conference travel are also available. Specific eligibility details are not provided in the text.

Information about the maximum allowable hours and the role of research assistant in terms of experience and skills at the Department of Economics is found here:

• According to the Student Employment Regulation, The maximum allowable work hours in any given week are 19 hours. 
• If you work for about 10 hours a week for 12 out of 13 weeks in a semester. Then the maximum you can earn is $3,000.
• This job is good for extracting skills and experience for IDE (presumably a program or department) graduates, particularly in light of the COVID-19 situation.

Here we get the information regarding the maximum work hours and earnings allowed for students under student Employment regulations, discuss a specific research assistant's role and highlight the importance of the research assistantship in providing valuable skills and experience for graduates, especially given the impact of COVID-19.