Quantitative researcher Interview Questions | Glassdoor.co.in

# Quantitative researcher Interview Questions

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### Quantitative Researcher at WorldQuant was asked...

6 Aug 2012
 Minimize the number of comparisons for finding minimum and maximum of a given set of numbers.6 AnswersGiven n numbers, the optimal number of comparison should be 3n/2 Pairwise compare all numbers = n/2 comparisons It is easy to see that the max, min lies among the n/2 elements which are greater, smaller respectively. Pairwise compare the n/2 greater elements = n/4 comparisons. Again pairwise compare the n/4 greater elements obtained in previous step = n/8 comparions. ... You get max(min) in n/4+n/8+...1 = n/2 comparisons. initial comparisons = n/2 comparisons to get max number = n/2 comparisons to get min number = n/2 Total = 3n/2Here is matlab code according to the suggested algorithm : clear; clc; vec=[3,8,7,2,1,6,5,4]; [max12,min12]=max_min(vec(1),vec(2)); [max34,min34]=max_min(vec(3),vec(4)); [max56,min56]=max_min(vec(5),vec(6)); [max78,min78]=max_min(vec(7),vec(8)); [max1234,~]=max_min(max12,max34); [max5678,~]=max_min(max56,max78); [max12345678,~]=max_min(max1234,max5678); fprintf('max=%d\n',max12345678); % Find Min [~,min1234]=max_min(min12,min34); [~,min5678]=max_min(min56,min78); [~,min12345678]=max_min(min1234,min5678); fprintf('min=%d\n',min12345678);More on the above analytic solution: The resulting sequence is geometric with missing first two terms, n + n/2. Sum of a geometric sequence n + n/2 + n/4 + ... + 1 = 2n So for the present sequence: sum = 2n - n - n/2 = n/2 Thus the minimum number of steps required for finding BOTH the minimum and maximum of the set of numeric values is 3n/2. However, to calculate only minimum or maximum, the minimum number of steps would be (n-1) by pairwise comparison.Show more responsesBy the same logic it is n-1 when only maximum or minimum has to be found out from n nos., the correct answer will be n/2 + (n/2-1)+(n/2-1) = 3n/2-2if n is even, 1+3*(n-2)/2=3n/2-2 if n is odd, 3(n-1)/2-2+2=3(n-1)/2Comparison would be less if the range is less with minimum to maximum

### Quantitative Analyst at Goldman Sachs was asked...

26 Dec 2012
 What is the expected number of tosses required to achieve 2 heads in an unbiased coin?5 Answers6 tosses using Markov-techniquesI got 4 as the answer...Expected number of steps required to obtain N consecutive heads by tossing a fair coin is given by En = 2^(n+1) -2 For n = 2 ; E2 = 6 For further details see - http://www.qbyte.org/puzzles/p082s.htmlShow more responsesThe question does not state 2 "consecutive" heads.answer would be 6 if it was 2 consecutive heads, but for 2 heads it is 4.

### Quantitative Analyst at DeepR Analytics was asked...

26 Jan 2019
 Buffon's Needle Problem2 AnswersAnswer available on Mathworld wolfram.can you tell me how did you apply and what was there shortlisting criteria based on resume??

### Quantitative Analyst at J.P. Morgan was asked...

9 Sep 2015
 Describe any one sorting algorithm in detail one puzzle regarding uniform distribution with two players where one players valuation of an item is twice that of others. explain new, delete keywords what is vega of an instrument?2 Answersmerge sort..do it recursivelyIf the game is that 2 players have to guess the closest integer which is the closest to twice the integer picked by the other player then by forward recursion the value picked by both will be the highest possible number (ie infinity if unbounded)

### Quantitative Researcher at India Health Action Trust was asked...

2 Apr 2019
 Salary expectation and When I can join?1 AnswerIt was pointless question because I did not get any offer from them

### Quantitative Research at J.P. Morgan was asked...

21 Aug 2018
 How to find a loop in a linked list?1 AnswerUse two pointers a tortoise and a hare...move torotise by 1 and hare by 2. if these two meet somewhere there is a loop in the linked list.

### Quantitative Research Analyst at J.P. Morgan was asked...

16 Feb 2021
 The interviewer first asked me to briefly introduce myself...Then went on to my resume and told me to tell about one of my projects....Then i had like 3 coding questions ....i was asked to tell the algorithm and the pesudo code...Others was a simple check on the basics and then a few probability questions1 AnswerJust have a paper pen with you...Tell out the whole thought process...try to reduce the complexity and tell them the solution...The interview people are really cool and patient...! and they help u throughout...! You just should not get scared or tensed ..!

### Quantitative Researcher at Acuity Knowledge Partners was asked...

31 Jan 2020
 Technology questions, market analysis etc.1 AnswerMostly related to resume.

### Quantitative Aptitude Trainer at Oviya MedSafe was asked...

11 Aug 2020
 If there consist of two pipes connected to a tank in which one pipe is used to inject water to the tank at the rate of 2L/hr and the other pipe is used to eject water at the rate of 3L/hr.when do the tank completely fill? 1 AnswerSince the rate of ejecting water is greater than injecting to the tank, the tank never gets filled completely

### Quantitative RiskAnalyst at KPMG was asked...

3 Sep 2020
 Describe in brief about your project? Some basic OOPS concepts.1 AnswerAnswer these questions confidently as they do not wanted tech nerd for these post .If you are an average person you can crack it but be good in your communication.
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