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Found 25 results

  1. Hi, I'd be very interested and grateful to read your thoughts on my situation. I'll start with my profile: PROFILE: Type of Undergrad: Maths, US News Global Top 10 (I'm from outside the US); econ courses from a programme that's little known internationally, but that's well-respected and places well onto master's programmes. Undergrad GPA: First class. Type of Grad: Not started yet; offer for Econometrics and Mathematical Economics MSc at LSE. GRE: Will take later. Math Courses: Real analysis (B+), Calculus & probability (B+), Linear algebra (first year A-, second year A-), Metric spaces & complex analysis (A-), Topology (B+) + quite a few more that are very pure and not very relevant. Econ Courses: Intermediate micro (A/A+), Intermediate macro (A/A+), Intermediate econometrics (A/A+), Maths for economics (A/A+). Research Experience: None that's relevant, will aim to do an RA/pre-doc after my master's. (Grades are listed using standard conversions -- we don't use A, B, C etc. in my country.) I couldn't take econ courses during my undergrad (students study specific programmes and outside options are very limited) but since graduating, I've taken classes in intermediate micro, macro, econometrics and maths for economics, all A or A+, depending on how you convert. I don't have any stats courses on my transcript but I've self-studied first and second year stats and second year probability. I did well in my undergrad overall but, as you can see, my grades in the courses that matter most for econ PhD applications aren't great. My undergrad was very rigorous and tough, so I'd like to think that these grades aren't as bad as they look, but they certainly don't look very good. It might be relevant that the first three (up to first year LA) were first year courses and I have an upwards trajectory from there. I have an offer for the MSc in Econometrics and Mathematical Economics at LSE, which I'll probably accept. I'm wondering how much these undergrad maths grades will matter for PhD applications after the MSc. I have some time to study before the MSc so I'm considering re-taking important courses/filling in important gaps, e.g. via NetMath from University of Illinois, Urbana-Champaign -- this was recently suggested on another thread. If my undergrad grades will be largely superseded by my MSc grades though, then it doesn't seem worth doing any formal study for credit before the MSc. (I would still self-study to prep for the MSc as it's very demanding, but I would go about this in a somewhat different way.) My questions are: (i) How much will my undergrad maths grades matter for PhD applications after my master's? (ii) How much would re-takes/additional courses compensate for my not great undergrad grades? (iii) If I take some courses for credit, which courses should I prioritise taking? Any other thoughts or suggestions are very welcome! Details on course content (feel free to ignore if not helpful): I'm not entirely sure how my maths courses map onto US courses/sequences as the system is quite different here and not at all standardised. E.g. My calculus course included some material I think is found in US differential equations courses. Calculus had some proofs but everything else was heavily proof-based. For brevity, I won't list everything but will hopefully give you a sense of what was covered. Analysis: sequences, series, continuity, differentiability, Riemann integration. Calculus: ODEs, partial derivatives, simple PDEs, parametric equations, line integrals, Jacobians, double integrals, surfaces, directional derivative. Probability: probability space and axioms, conditional probability, law of total probability, discrete and continuous random variables, joint, marginal, conditional distributions, conditional expectation, random walks, probability generating functions, Weak Law of Large Numbers. Linear algebra (first year): using matrices to solve systems of linear equations, vector spaces, subspaces, bases, linear transformations, Rank-Nullity Theorem, bilinear forms and real inner product spaces, eigenvectors, Spectral Theorem. Linear algebra (second year): abstract vector spaces, rings, quotient spaces, dual spaces, adjoints for linear maps, orthogonal maps. Metric spaces: metric spaces, isometries, continuity, completeness, Contraction Mapping Theorem, connectedness, compactness. Topology: abstract topological spaces in terms of open sets, continuity, connectedness, accumulation points, basis of a topology, product topology, quotient topology, abstract simplicial complexes.
  2. I’ve taken the PhD sequence in Micro and Metrics at my unranked university and received A’s. Textbooks were Greene and Wooldridge for Metrics and MWG for Micro. As for math, I’ve taken multivariate calculus, Linear Alg I-II, Diff Eq, Probability, Math Stats, Real Analysis I-II, Set Theory, Topology, and grad lebesgue theory. (A’s in all classes). For research, I've RA'ed for a few years with two professors and did a senior thesis on an empirical topic. I'm graduating with a B.S. in Mathematics and Economics. During my pre-doc RA stint at a Fed bank, I have the opportunity to take some courses at a T40 program. If you could pick two courses from below, what would you advise? My interests are in Micro and Metrics. Grad topology Grad functional analysis Grad complex analysis Measure theoretic probability Abstract Algebra PhD Micro I (again, but this time at a better institution) Other (something else)
  3. My college doesn't offer Real Analysis. What other class should I take or is similar to Real Analysis?
  4. Choosing between measure theoretic probability and a graduate statistics class using Casella/Berger. I have some expectation of doing theory in the future, but I'm not all in. Which should I take? What are the important considerations?
  5. Hello, I will be applying for Masters and PhD programs in Economics. I am an Econ major and Math minor who has limited experience in truly theoretical math courses (I have taken real analysis and a course in probability theory). My question is whether I should take the second course in probability theory (with real analysis prerequisite) and complete the pairing, or a more applied upper-level course in time series analysis. For economics and econometrics graduate programs, I know theoretical courses are generally preferred but the time series course happens to be very pertinent to economics/econometrics so I am wondering which one would be looked upon better. The probability theory course is a 300 level (3rd year) while the time series course is a 400 level (4th year). I can get the same mark in both. Any thoughts are appreciated. Thank you very much.
  6. The math courses I hope to have finished by undergrad end are: - calculus sequence (single var, multi var, linear algebra/differential equations) - linear algebra - real analysis 1 and 2 - probability (calculus based) - statistical inference - mathematical statistics - stochastic processes - probability (measure theoretic) Is there an important math class that I'm neglecting? Are any of these functionally irrelevant for applications and should be replaced?
  7. Where can I find real analysis, topology, and probability theory? I’m looking for fully online courses.
  8. Hi, I am trying to decide on which undergrad math courses to take for PhD econ. I have three classes in mind: probability, stat inference, and stochastic op research. Ideally, I would take all, but I'd need to drop one. I've been thinking that probability is the most important one out of them, but it's with a notoriously bad professor. So, my heart tells me that i should drop probability, but I am not sure how important it is to have probability on the list of classes I took in undergrad. Any advice/opinion on this? Thanks in advance!
  9. a box contains six balls numbered 1 to 6. Two balls are selected from the box, one after the other and with replacement. If the sum of the numbers on the balls picked is 10, what is the probability that one of the balls picked was numbered 6
  10. Hello-- I am preparing to apply to an Econ PhD. I have taken Calculus I, II, multivariate, differential equations, and linear algebra. (I have also taken statistics and two curses in applied econometrics.) I have time and money for an extra course. I am debating whether to take Real Analysis or Probability Theory. Which one would you recommend I take?
  11. In a graduation class of a certain college 48% of students are males and 52% are females. In this class 40% of the males and 20% of the female students are 20 yrs or older. If one student in the graduating class is randomly selected approximately, what is the probability that he or she will be less than 25 yrs old? A) 0.90 B) 0.70 C) 0.45 D) 0.30 E) 0.25 Thanks!
  12. swack60


    Seven digits from the numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9 are written in random order. The probability that this seven digit numbers is divisible by 9 is : a. 7/9 b. 1/9 c. 2/9! d. 4/9 Please help me through the above problem. anyone please explain.
  13. swack60


    Hello there!!!! Please help me through the below probability problem: There are 8 red balls, 5 green balls and 3 blue balls. Three balls randomly picked up without replacement. i) What is the probability that the third ball would be a blue one? ii) What is the probability that the 2nd ball would be either green or red ball?
  14. A group of 3 Men and 3 Women is to be selected from a group of 5 Men and 6 Women. What is the probability that a particular man will NOT be in the group and a particular lady WILL BE in the group ? A. 1C0 *4C3 * 5C2 / (5C3 * 5C3) B. 1C0 * 1C1 * 5C2 / (6C3) C. 4C3 * 5C2 / (5C3 * 6C3) Ans. For the solution, I am able to get the denominator term, I am even able to get the condition for men i.e. 4C3 but I am not able to evaluate the condition for women i.e. 5C2. Please help. Thanks in advance,
  15. Q. n points are equally spaced on a circle, where n is an even number greater than 3. If 3 of the n points are to be chosen at random, what is the probability that a triangle having the 3 points chosen as vertices will be a right triangle? This problem was posted in the Math Challenge section of MGRE. My solution is 3 / (n-1). Can anybody confirm the answer please ?
  16. What if we were able to collect accurate profiles from most of our cohort in the school we end up going to, and maybe the profiles from the following 2 or 3 cohorts, and used all the data to come up with a probability model that can roughly state the probability of acceptance to a given school. For example: Let's say I go to Penn State. If I can get a good number of profiles, I could estimate a model like, Probability of Acceptance at PSU = B0 + B1*(Rank of Undergrad school) + B2*(# of semesters of Real Analysis) + B3*(# of grad level econ courses taken) + B4*(GPA in econ) + ....... + Bn*(other factors) Then, we could do tons of hypothesis testing and come up with confidence intervals. I can't say if the model would be accurate or not, but I'm sure I would have a lot of fun doing this. Then, we could coordinate with some members going to schools in different tiers to come up with their models and post them to the forum. I think that would make profile evaluations much more fun for everyone. What do you guys think? (I already know this is stupid, so be creative and try saying some other things)
  17. I was doing a GREmath practice book and came across this question. P(A or B) = 0.60 and P(A) = 0.20 a. Find P(B) given that events A and B are mutually exclusive. b. Find P(B) given that events A and B are independent. For part a. I understand, P(A or B) = P(A) + P(B) therefore, P(B) is 0.40, and that agrees with the answer key. But, for part b. I'm not sure whats going on. I feel like it must be something simple that I'm missing. For independent cases I know that P(A and B) = P(A)P(B), but I don't see how to get P(B) The answer key says that for part b, P(B) is 0.50, could anyone help me in understandin this one? Thanks
  18. hi there , i'm just feel that probability is easy unless came to part of properties , need explain about this involving probability of 2 events are not mutually exclsive this is the look of Not Mutually exclusive property P(E OR F) = P(E) + P(F) - P(E AND F) i need to know what is the P(E AND F) , here is example to help for explaining this question , thank for help anyway Example 4: One student's name will be picked at random to win a CD player. There are 12 male seniors, 15 female seniors, 10 male juniors, 5 female juniors, 2 male sophomores, 4 female sophomores, 11 male freshmen and 12 female freshman. b) a freshman or a female is picked. Round answers to three decimal places. i need to know exactly why we choosed P(E AND F) to be 12/71 http://www.www.urch.com/forums/attachments/gre-math/6236-need-help-about-properties-probability-col_alg_tut58ex4b5.gif
  19. Here's a tricky one! A bag contains 5 white marbles and 5 black marbles. If each of 5 girls and 5 boys randomly selects and keeps a marble, what is the probability that all of the girls select the same colored marble? A) 1/126 B) 1/120 C) 1/24 D) 4/25 E) 1/2 Cheers, Brent
  20. Q] If the probability of getting something is 0.4, then what would be the probability of getting the same thing 4 times (assume probability of all trials remains the same) ? Now, i] Is this type of question to be solved using Binomial Distribution ? ii] If yes, what would be the formula to calculate the above probability ? iii] What would be the mean, variance and std. Deviation ? PLease also mention the formula you have used.
  21. Probability of you seeing a bus passing by each day is 10%. So, what is the probability of seeing a bus passing by on eleventh day? Any help will be appreciated.
  22. The probability of Person A working accurately is 90%. The probability of Person B working accurately is 80%. So, with given facts, what will be the probability of work that is started by Person A and later is handed over to Person B who delivers the work.
  23. help me guys, need to solve these problems as soon as possible...... 1.For the FIFA world cup, Paul the octopus has been predicting the winner of each match with amazing success. It is rumored that in a match between 2 teams A and B, Paul picks A with the same probability as A's chances of winning. Let's assume such rumors to be true and that in a match between Ghana and Bolivia, Ghana the stronger team has a probability of 9/10 of winning the game. What is the probability that Paul will correctly pick the winner of the Ghana-Bolivia game? a) 0.9 b) 0.62 c) 0.79 d) 0.82 Ans is given 0.82 2. A lady has fine gloves and hats in her closet- 18 blue- 32 red and 25 yellow. The lights are out and it is totally dark inspite of the darkness. She can make out the difference between a hat and a glove. She takes out an item out of the closet only if she is sure that if it is a glove. How many gloves must she take out to make sure she has a pair of each colour? a) 50 b) 8 c) 60 d) 42 3. A hare and a tortoise have a race along a circle of 100 yards diameter. The tortoise goes in one direction and the hare in the other. The hare starts after the tortoise has covered 1/5 of its distance and that too leisurely. The hare and tortoise meet when the hare has covered only 1/8 of the distance. By what factor should the hare increase its speed so as to tie the race? a) 40 b) 37.80 c) 8 d) 5 Ans: 37.80 4. Alok and Bhanu play the following min-max game. Given the expression N = 9 + X + Y - Z Where X, Y and Z are variables representing single digits (0 to 9), Alok would like to maximize N while Bhanu would like to minimize it. Towards this end, Alok chooses a single digit number and Bhanu substitutes this for a variable of her choice (X, Y or Z). Alok then chooses the next value and Bhanu, the variable to substitute the value. Finally Alok proposes the value for the remaining variable. Assuming both play to their optimal strategies, the value of N at the end of the game would be a) 27 b) 0.0 c) 20 d) 18 Ans: 20 pls provide explanations is possible Thnx in advance........
  24. If a fair coin is tossed a 100 times what is the probability that at least 60 outcomes will be head?
  25. Hi guys....I found this problems. 1) My brother, my cousin and I were in the same class of 70 students. My brother graduated at top of the class, whereas I ranked 27th at graduation. What's probability that my cousin ranked between me and my brother? For me, the probability is 25/68; but according to the book the prob. is 25/70. What do you think? 2) List A: 1,3,5 List B: 2,5,6 If you select a number each from List A and List B above, what's the chance that the product of the two numbers selected will be an odd number? For me, the probability is 1/3; but according to the book the prob. is 3/8. What do you think?
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