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A/B Testing

Algorithms

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Machine Learning

Probability

Product Metrics

Python

Statistics

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Suppose there exists a new airline named Jetco that flies domestically across North America. Jetco recently had a study commissioned that tested the boarding time of every airline, and it came out that Jetco had the fastest average boarding times of any airline.

What factors could have biased this result, and what would you look into?

What could potentially bias the average boarding time in favor of an airline that only flies domestically?

What could potentially bias the average boarding time in favor of an airline that only flies domestically?

Boarding Times Bias

A new airline came out as the fastest average boarding times compared to other airlines.  What factors could have biased this result and what would you look into?

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?

In an A/B test, how can you check if assignment to the various buckets was truly random?

In an A/B test, which of the following is a common method to determine if the assignment to the test groups was truly random?

In an A/B test, which of the following is a common method to determine if the assignment to the test groups was truly random?

Random Bucketing

A/B Testing & Experimentation

<h3>Job Description</h3><div>Job Description<div><div>Company Overview: With an annual budget of $2.3 billion and more than 7,000 employees throughout the five boroughs, the New York City Department of Health and Mental Hygiene (NYC DOHMH) is one of the largest public health agencies in the world, serving 8 million New Yorkers from diverse ethnic and cultural backgrounds. We're tackling a broad range of public health issues with innovative policies and programs and getting exceptional results, but our work is never finished. The breadth of our innovative programs provides the widest range of choices for every member of our team. With grant funds from the Centers for Disease Control and Prevention (CDC), DOHMH is undertaking a new initiative that will meet critical infrastructure needs and make possible strategic investments that will have lasting effects on public health. Investments and improvements through this initiative will help modernize DOHMH’s foundational capabilities and data infrastructure, enabling it to partner in complex health and health care environments and, in turn, support better public health outcomes. This initiative supports larger efforts to rebalance investments in public health and more equitably serve communities and populations. The selected candidate will be an employee of Public Health Solutions, a nonprofit organization which is the fiscal and administrative manager of the grant, but the work will be supervised by DOHMH. This is a grant-funded position ending in November 2027.The Bureau of Division Management & Systems Coordination (DMSC), part of the Division of Disease Control (DDC), supports all other DDC bureaus with monitoring and analyzing trends in disease data, used for the recognition, prevention, and control of infectious diseases. Within DMSC, the Surveillance Unit coordinates with disease surveillance programs within DDC, the Division of Information Technology, and external partners to maintain and enhance existing surveillance system applications and implement new surveillance system applications to support complete, timely, and equitable case detection and health information exchange while ensuring data confidentiality, data quality, and compliance toward regulatory standards. DDC is in the process of replacing its current Electronic Disease Reporting Infrastructure (EDRI) in order to continue meeting these goals. Job Description:We are seeking to fill positions in the Division of Disease Control that will provide key support for DOHMH’s work of detecting, tracking, investigating, and preventing infectious diseases in New York City. Reporting to the Director of Electronic Case Reporting, this position will provide expert knowledge of Health Level 7 (HL7) standards used by healthcare facilities to report infectious disease cases to DOHMH and support the EDRI replacement project. It is expected that the position will work 35 hours per week.Duties:<ul><li>Develop software solutions to capture, process, store, and perform quality assurance on data from incoming reports from Electronic Health Records (EHR), Regional Health Information Organizations (RHIO), Health Information Exchanges (HIEs), healthcare facilities, providers, and their office staff. </li><li>Apply technical and problem-solving skills and partner with agency stakeholders, the Division of IT and other staff within DDC to recommend and implement solutions for common issues and enhancements for EDRI</li><li>Support projects that currently have or will have data flows into EDRI, including but not limited to electronic case reporting (eCR), electronic laboratory reporting, and the Citywide Immunization Registry.</li><li>Enhance and improve the production eCR system based on evolving city, state, and federal standards and requirements.</li><li>Provide subject matter expertise for relevant Clinical Document Architecture (CDA), Fast Healthcare Interoperability Resources (FHIR), United States Core Data for Interoperability (USCDI) standards, Java software development and related frameworks.</li><li>Update, support, and maintain DOHMH software applications used to capture case reports</li><li>Respond to and resolve software security and unsupported software issues, to protect the confidentiality of patient information entrusted to DOHMH.</li><li>Assist agency analysts with the process of ensuring that the data received is of the highest possible quality.</li></ul>Qualifications:<ul><li>5+ years of experience with SQL databases</li><li>5+ years of experience building Object oriented software in Java, Python, Scala, or R</li><li>5+ years of experience assuring security of sensitive data</li><li>Experience with large volumes of data</li><li>Strong organization and time management skills</li><li>Good written and verbal communication skills</li><li>Ability to work independently as well as part of a team</li><li>Undergraduate degree or certificate in Data Science, Mathematics, Applied Mathematics, Statistics, Applied Statistics, Computer Science, Computer Engineering, Electrical Engineering, Physics, Public Health, or a similar field of study</li><li>The ideal candidate for this position must be a pro-active and self-motivated individual with the ability to work in teams and in a highly dynamic environment with multiple stakeholders and timelines.</li></ul>Additional Desired Qualities: <ul><li>Advanced degree in Data Science, Mathematics, Applied Mathematics, Statistics, Applied Statistics, Computer Science, Computer Engineering, Electrical Engineering, Physics, Public Health, or a similar field of study</li><li>3+ years of experience with clinical messaging standards (i.e., HL7) and health-related coding systems (i.e., LOINC, ICD-10)</li><li>Experience with public health surveillance and health-related data, particularly disease reporting</li><li>Experience with eCR</li><li>R or Python</li><li>Experience working with the public health sector and coordinating projects involving multiple stakeholders. </li></ul>Benefits:<ul><li>Hybrid Work Schedule.</li><li>Generous Paid Time Off and Holidays.</li><li>An attractive and comprehensive benefits package including Medical, Dental and Vision.</li><li>Flexible Spending Accounts and Commuter Benefits.</li><li>Company Paid Life Insurance and Disability Coverage.</li><li>403 (b) + employer matching and discretionary company contributions.</li><li>College Savings Plan.</li><li>Ongoing training and continuous opportunities for professional growth and development.</li></ul>Additional Information: <ul><li>This is a temporary grant-funded position ending in November 2027.</li><li>This individual must reside in the tri-state area (NY, NJ, CT) by their confirmed start date. </li><li>Preference may be given to individuals residing in New York City (5 boroughs) or surrounding New York State counties. </li><li>This individual will be expected to work non-business hours during emergencies.</li></ul>At PHS, we place immense value on diversity within our teams, understanding that varied backgrounds and experiences significantly enhance our community and propel us toward our goals. If you find you don’t have experience in all the areas listed above, we still encourage you to apply and share your background and experiences in your application. We are eager to discover how your unique perspective can bring positive transformations to our team and help advance our mission of creating healthier, more equitable communities. We look forward to learning more about you!PHS is proud to be an equal opportunity employer and encourages applications from women, people of color, persons with disabilities, LGBTQIA+ individuals, and veterans. </div> Monday-Friday Remote 35 Hours Per Week</div></div>

Question	Topic	Difficulty	Ask Chance
Boarding Times Bias	Statistics	Medium	Very High
Hundreds of Hypotheses	Statistics	Medium	Very High
Random Bucketing	A/B Testing & Experimentation	Medium	Very High

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