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You are testing hundreds of hypotheses with many t-tests. What considerations should be made?

What is a key disadvantage of the F-test when compared to multiple t-tests?

What is a key disadvantage of the F-test when compared to multiple t-tests?

Hundreds of Hypotheses

You are testing hundreds of hypotheses with many t-tests. What considerations should be made?

Let’s say that your company is running a standard control and variant AB test on a feature to increase conversion rates on the landing page. The PM checks the results and finds a .04 p-value.

How would you assess the validity of the result?

Experiment Validity

Let’s say you work for a social media company that has just done a launch in a new city. Looking at weekly metrics, you see a slow decrease in the average number of comments per user from January to March in this city.

The company has been consistently growing new users in the city from January to March.

What are some reasons why the average number of comments per user would be decreasing and what metrics would you look into?

What metric could be used to measure if active users are still engaging on the platform despite an overall decrease in the average number of comments per user?

What metric could be used to measure if active users are still engaging on the platform despite an overall decrease in the average number of comments per user?

Decreasing Comments

How would you investigate a decline in the average number of comments per user?

Stanford University Salaries by Position

The Stanford Cyclotron and Radiochemistry Facility (CRF) generates clinically approved and novel radiotracers to advance early detection and treatment of diseases, ultimately improving human health. The Research Scientist will be involved directly with the development and execution of clinical and preclinical research goals/activities of CRF. The candidate will work under the direction of the facility manager with respect to the department's radiochemistry program needs, including routine and novel radiotracer development, production, troubleshooting, and prioritization/facilitation of clinical radiotracer translation.Stanford University is an equal opportunity employer and is committed to increasing the diversity of its faculty and academic staff. It welcomes nominations of and applications from women and members of minority groups, as well as others who would bring additional dimensions to the University's research, teaching and clinical missions.As an organization that receives federal funding, Stanford University has a COVID-19 vaccination requirement that will apply to all university employees, including those working remotely in the United States and applicable subcontractors. To learn more about COVID policies and guidelines for Stanford University Staff, please visit https://cardinalatwork.stanford.edu/working-stanford/covid-19/interim-policies/covid-19-surveillance-testing-policyQUALIFICATIONS* KNOWLEDGE: Describe the technical or business knowledge required or desired to complete the job's primary responsibilities.REQUIRED:* Ph.D. degree or equivalent in radiochemistry or a related scientific field (e.g., chemistry) in addition to three years of relevant experience.* Comprehensive understanding of radiochemistry with a focus on 18F/11C or radiometal radiolabeling strategies and troubleshooting.* Sets up, operates, maintains, cleans, and calibrates automated and semi-automated radiopharmaceutical manufacturing and quality control equipment* Extensive experience with radiotracer quality control techniques, including High Performance Liquid Chromatography (HPLC), Thin Layer Chromatography (TLC), gas chromatography (GC), Radioactivity Detectors, endotoxin, etc.* Ability to follow established radiation safety procedures while developing and executing an approved radiochemistry production.* In collaboration with staff, provides data to support Chemical Manufacturing and Control (CMC) documents as part of IND (Investigational New Drug) submissions to the FDA (Food and Drug Administration)* General computer skills, experience with databases, cloud-based storage, and the ability to quickly learn/master various scientific computer programs (such as Chemstation, Tracerlab, Chromeleon etc.).* Ability to work independently and/or as part of a cross-functional team.DESIRED:* Expert level knowledge and hands on experience with operating, optimizing, and troubleshooting automated radiosynthesis platforms (prefer GE FX N and/or FX C series of automated modules).* Prior experience with cyclotron operation is preferred.* Prior experience with USP <823> or <825> Radiopharmaceutical Drug Production.* Supervisor experience, especially for training students for performing experiment.Additional Information* Schedule: Full-time* Job Code: 6280* Employee Status: Regular* Grade: R99* Department URL: http://radiology.stanford.edu/* Requisition ID: 92843

Include and responsibilities include - : Molecular cloning. RNA purification. RNA sequencing. Cell culture. Mouse handling. Flow-cytometry analysis and sorting. Microscopy, protocol optimization. Novel assay development. Attendance at weekly lab meet Research Scientist, Research, Scientist, Biology, Technology, Education

Leveraging state-of-the-art large language models, administer research activities. - Collect and analyze data, create reports, review and explain trends to determine effectiveness, formulate and evaluate solutions to data issues, and make recommendat Research Scientist, Technology, Legal, Research, Innovation, Scientist

The Stanford Cyclotron and Radiochemistry Facility (CRF) generates clinically approved and novel radiotracers to advance early detection and treatment of diseases, ultimately improving human health. The Research Scientist will be involved directly wi Research, Scientist, Science, Chemistry, Technology, Education, University, Clinical

Job Code: 6280Job Grade: R99Term: 100% FTE, Fixed term appointment for 1 year.Project Description/Role of AS-R:Under the direction of the Principal Investigator, the successful candidate will work with multiple faculty, research scientists, post-doctoral scholars, graduate students, and undergraduates across multiple departments on the Stanford University campus, UC Berkeley, and multiple Silicon Valley companies. The successful candidate will leverage outstanding resources and infrastructure. Efforts may include development of new hardware, pulse sequences, image reconstruction techniques, and image analysis methods, including machine learning/AI. The candidate will also participate in manuscript preparation, manuscript submission, abstract presentations at conferences, and grant applications.The successful candidate will contribute to ongoing projects in the lab and will help select, train and supervise junior lab members including post-docs, and students of all levels. The candidate will also majorly contribute to researching and writing manuscripts and grants. The position requires a highly self-motivated, accomplished individual with an outstanding track-record of innovation and success in postdoctoral research and fellowship with a strong publication record. Additionally, the position will require working in team environments.Duties include:* Design research approaches for a major portion of research project(s), including background research, experimental design and execution, problem-solving, and writing up for publication.* Develop new protocols; test and evaluate a variety of approaches.* Perform complex experiments, and maintain detailed records of experiments and outcomes; analyze and interpret research data resulting from original procedures and methods.* Assist with new research proposals and applications for funding and grants.* Lead or participate in multidisciplinary teams across different faculties or schools.* Prepare periodic progress reports or written reports on all phases of the research project.* Contribute substantively to the preparation of papers for publication, especially in the results section. May be a co-author on publications. Present ongoing work and findings to colleagues at academic conferences.* Perform ongoing literature review to remain current with new procedures and related research; propose new research directions based on new advances discussed in literature.* Formally supervise, teach and train new staff or students as needed (including graduates and undergraduate students, PhD students and Post-Doc), including hiring, performance management, and related duties, in addition to instruction on techniques and consultation on project work.As an organization that receives federal funding, Stanford University has a COVID-19 vaccination requirement that will apply to all university employees, including those working remotely in the United States and applicable subcontractors. To learn more about COVID policies and guidelines for Stanford University Staff, please visit https://cardinalatwork.stanford.edu/working-stanford/covid-19/interim-policies/covid-19-surveillance-testing-policyVisa sponsorship is not available for this position. All candidates must be eligible to work in the U.S.* - Other duties may also be assigned.Qualifications:Required:* PhD degree or equivalent in related scientific field and five years of related experience.* Expert level knowledge and skills in field of science related to research project.* Strong analytical skills and excellent judgment.* Ability to work under deadlines with general guidance is essential.* Excellent organizational skills and demonstrated ability to complete detailed work accurately and record thoroughly.* Developed project management skills.Desired:* Experience in developing new MRI techiques.* High performance computing and machine learning skills.* Highly organized, and have demonstrated excellence, innovation and productivity in research.* Able to work independently and function effectively as part of a team of physicians, students, postdoctoral fellows, and laboratory and animal technicians and staff.Contact information:* For more information, please contact Shreyas Vasanawala (admin_vasanawala@stanford.edu)WORK STANDARDS:* Interpersonal Skills: Demonstrates the ability to work well with Stanford colleagues and clients and with external organizations.* Promote Culture of Safety: Demonstrates commitment to personal responsibility and value for safety; communicates safety concerns; uses and promotes safe behaviors based on training and lessons learned.* Subject to and expected to comply with all applicable University policies and procedures, including but not limited to the personnel policies and other policies found in the University's Administrative Guide, http://adminguide.stanford.edu.How to apply should be included if posted outside of Stanford employment website. Please direct all applicants to http://stanfordcareers.stanford.edu/."Stanford is an equal employment opportunity and affirmative action employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, protected veteran status, or any other characteristic protected by law. Stanford welcomes applications from all who would bring additional dimensions to the University's research, teaching and clinical missions."Additional Information* Schedule: Full-time* Job Code: 6280* Employee Status: Fixed-Term* Grade: R99* Requisition ID: 82821

We are seeking a highly motivated and team-oriented Research Scientist to join RNA Medicine program at Stanford led by Professor Howard Chang. The successful candidate will work with a multidisciplinary research team on the design and development of novel RNA therapeutics. Research is focused on addressing technology bottlenecks for the use of mRNAs, long noncoding RNAs, and circular RNAs for immune modulation, genome editing, and vaccines with broad applications for addressing human diseases.This will be a 2-year fixed-term positions with a possibility for extension based on performance and the availability of funding.Responsibilities of the Research Scientist will include molecular cloning, RNA purification, protein production, cell culture, protocol optimization and scaling, novel assay development, attendance at weekly lab meetings, and participation in the training of postdoctoral fellows, graduate students, and research assistants. S/he will be involved in multiple projects and will be expected to make scientific and written contributions to justify first or co-authorship on manuscripts for publication.Required:* PhD and/or MD degree with at least 5 years of relevant research experience in academia and/or industry* Strong background in molecular biology, RNA biology, and mammalian cell culture* Proven track record in research* Ability to work both independently and collaborativelyPreferred:* Experience with RNA formulation, protein production, and technology development* Experience with gene transfer, functional genomics, or immunologyAffirmative Action StatementStanford is an equal employment opportunity and affirmative action employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, protected veteran status, or any other characteristic protected by law. Stanford welcomes applications from all who would bring additional dimensions to the University's research mission.The expected pay range for this position is $80,000 to $100,000 per annum.Stanford University has provided a pay range representing its good faith estimate of what the university reasonably expects to pay for the position. The pay offered to the selected candidate will be determined based on factors including (but not limited to) the experience and qualifications of the selected candidate including equivalent years since their applicable education, field or discipline; departmental budget availability; internal equity; among other factors.At Stanford University, base pay represents only one aspect of the comprehensive rewards package. The Cardinal at Work website (https://cardinalatwork.stanford.edu/benefits-rewards) provides detailed information on Stanford's extensive range of benefits and rewards offered to employees. Specifics about the rewards package for this position may be discussed during the hiring process.Consistent with its obligations under the law, the University will provide reasonable accommodations to applicants and employees with disabilities. Applicants requiring a reasonable accommodation for any part of the application or hiring process should contact Stanford University Human Resources by submitting a contact form.Stanford is an equal employment opportunity and affirmative action employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, protected veteran status, or any other characteristic protected by law.The job duties listed are typical examples of work performed by positions in this job classification and are not designed to contain or be interpreted as a comprehensive inventory of all duties, tasks, and responsibilities. Specific duties and responsibilities may vary depending on department or program needs without changing the general nature and scope of the job or level of responsibility. Employees may also perform other duties as assigned.Additional Information* Schedule: Full-time* Job Code: 5574* Employee Status: Fixed-Term* Grade: R99* Requisition ID: 101506* Work Arrangement : On Site

The Das Lab in the Department of Biochemistry is seeking a Ph.D.-level, Basic Life Science Research Scientist with a passion for science and learning. This position is for a 3 year fixed-term, with a possibility of renewal. We are interested in developing predictive models for RNA folding based on cryo-electron microscopy and emerging deep learning frameworks.This position offers an opportunity to participate in and lead exciting and fast-paced research. The successful candidate will learn and advance a variety of laboratory methods, including RNA biochemistry, RNA cryo-electron microscopy, and data analysis, as well as computational methods, including training 3D neural networks. Ideal candidates demonstrate deep intellectual curiosity, have strong organizational and communication skills, cherish teamwork, and desire to strive for excellence. Previous experience in molecular biology and structural biology research is required.This position offers the opportunity to work closely with the principal investigator, lab members, and collaborators in an interactive, supportive, and inclusive lab environment. You will pioneer and advance biochemical and structural biology through both experimental methods like cryo-electron microscopy and cutting-edge computational methods involving deep learning neural networks. Finally, you will have the opportunity to develop scientific communication skills and to write rigorous and foundational publications that will demonstrate your ability to subsequently lead your own independent research group.The expected pay range for this position is $74,000 - $90,000 per annum.Stanford University has provided a pay range representing its good faith estimate of what the university reasonably expects to pay for the position. The pay offered to the selected candidate will be determined based on factors including (but not limited to) the experience and qualifications of the selected candidate including equivalent years since their applicable education, field or discipline; departmental budget availability; internal equity; among other factors.Stanford University has provided a pay range representing its good faith estimate of what the university reasonably expects to pay for the position. The pay offered to the selected candidate will be determined based on factors including (but not limited to) the experience and qualifications of the selected candidate including equivalent years since their applicable education, field or discipline; departmental budget availability; internal equity; among other factors.Stanford is an equal employment opportunity and affirmative action employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, protected veteran status, or any other characteristic protected by law. Stanford welcomes applications from all who would bring additional dimensions to the University's research mission.QUALIFICATIONS / MINIMUM REQUIREMENTS:* Ph.D., and or M.D., or equivalent.* Record of collaboration and mentorship during postgraduate research.* Lead authorship of peer-reviewed publication(s) describing methodological advances in cryo-electron microscopy experiments and/or computational analysis.* Outstanding command of written and verbal English.Additional Information* Schedule: Full-time* Job Code: 5574* Employee Status: Fixed-Term* Grade: R99* Requisition ID: 103884* Work Arrangement : On Site

(Full-time, 2 year contract, renewable) The Stanford Institute for Human-Centered Artificial Intelligence (HAI) is a rapidly growing institute within the office of the Vice Provost and Dean of Research at Stanford University. The mission of HAI is to Data Engineer, Engineer, Research, Technology, Data

Stanford University Interview Questions

Stanford University Interview Guides

Stanford University Interview Questions

Stanford University Salaries by Position

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