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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 we have a table with an <code>id</code> and <code>name</code> fields. The table holds over 100 million rows and we want to sample a random row in the table without throttling the database.

Write a query to randomly sample a row from this table.

Input:

<code>big_table</code> table

<table>
<thead>
<tr>
<th>Columns</th>
<th>Type</th>
</tr>
</thead>

<tbody>
<tr>
<td><code>id</code></td>
<td>INTEGER</td>
</tr>

<tr>
<td><code>name</code></td>
<td>VARCHAR</td>
</tr>
</tbody>
</table>

Write a query to randomly sample a row from a big table.

Random SQL Sample

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?

Nomura Salaries by Position

Corporate Title: Vice President Department: Global Markets Location: New York The pay range for this position at commencement of employment is expected to be between $225,000 and $300,00 year* Company Overview Nomura is a global financial services group with an integrated network spanning approximately 30 countries and regions. By connecting markets East & West, Nomura services the needs of individuals, institutions, corporates and governments through its three business divisions: Wealth Management, Investment Management, and Wholesale (Global Markets and Investment Banking). Founded in 1925, the firm is built on WalkMea tradition of disciplined entrepreneurship, serving clients with creative solutions and considered thought leadership. For further information about Nomura, visit www.nomura.com. Aon's Benefit Index®, Nomura's benefits rank #1 amongst our competitors Department Overview We are looking for a junior quantitative analyst for a role in Equity Derivatives Quant group based in NY. The team specializes in the modelling of equity derivatives products involving numerical methods such as Monte Carlo, finite difference and a broad number of optimization techniques. The team also create tools to improve the firm's capabilities in trading and risk management of equity derivatives products. Role Description <ul> <li>Support and further develop quantitative models within the existing framework;</li> <li>Provide expertise on financial products;</li> <li>Deliver high quality work well and on time and manage multiple projects under time pressure.</li></ul> Skills, Experience, Qualifications and Knowledge Required <ul> <li>PhD in science, mathematics, physics engineering, statistics</li> <li>2+ years of relevant industry experience, preferably at a large IB. </li> <li>Equity derivative experience in quant or model validation role </li> <li>Knowledge of stochastic calculus</li> <li>Ability to learn and grow</li> <li>C++, Python experience. C# is a plus</li> <li>Experience with numerical methods (Monte Carlo, numerical integration, PDE/ODE solving techniques) is a plus </li> <li>Ability to work with geographically distributed teams;</li> <li>Strong oral and written communication skills: ability to articulate complex concepts and technical ideas to non-technical personnel</li></ul> *base pay offered may vary depending on multiple individualized factors, including market location, corporate and functional title and duties, job-related knowledge and advanced degrees, skills, and experience. The total compensation package for this position may also include other elements, including a sign-on bonus, restricted stock units, and discretionary awards in addition to a full range of medical, financial, and/or other benefits (including 401(k) eligibility and various paid time off benefits, such as vacation, sick time, and parental leave), dependent on the position offered. Details of participation in these benefit plans will be provided if an employee receives an offer of employment. If hired, employee will be in an "at-will position" and the Company reserves the right to modify base salary (as well as any other discretionary payment or compensation program) at any time, including for reasons related to individual performance, Company or individual department/team performance, and market factors". Nomura is an Equal Opportunity Employer

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