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Nov
22
comment How Can I Find the Probability of Drawing This Sample?
the name of this probability distribution is the multinomial distribution
Nov
22
comment How Can I Find the Probability of Drawing This Sample?
You need to account for the fact that maybe you drew RRWWBB, or RRWBWB, or RRBBWW, or...
Nov
20
awarded  Notable Question
Oct
17
comment Does the implication $x>1\implies x>1/x$ need to be proven?
@Question sometimes we start with axioms to avoid having to provide proofs of "self evident facts"
Oct
15
comment If an empty set is an element of a set, $\{5,\{\}\}$ is that equal to just $\{5\}$?
no, it is not true that the sets are equal.
Oct
12
awarded  Yearling
Jul
19
comment Example of a homeomorphism on the real line?
what do you mean "appropriate"? homeomorphism also need to be bijective, and don't necessarily need to be on compact sets. Think about 1/x
Jun
24
awarded  Good Answer
May
30
comment How to Find a Probability with Monte Carlo Simulation
since there are certainly many ways of creating a solution to the problem and i'm sure there are R packages that could help as well, it would be helpful to explain your thought process
May
30
comment How to Find a Probability with Monte Carlo Simulation
well can you edit your question to update your approach to the problem at least? maybe write your math answer in pseudo-code and someone can help translate it (although this isn't site isn't really geared towards programming and there are wonderful resources on the web for learning R)
May
30
comment How to Find a Probability with Monte Carlo Simulation
What are you having problems with, the math or the coding?
May
18
awarded  Popular Question
Mar
22
revised Can't Get Present Value Answer?
added 21 characters in body
Mar
22
answered Can't Get Present Value Answer?
Mar
22
comment Can't Get Present Value Answer?
My only other pieces of advice are to make sure you are using the correct interest rate, and double checking your formula. 8% compounded quarterly is 2% effective quarterly, and I've never seen present value described as you have laid it out (see e.g. wikipedia)
Mar
22
comment Can't Get Present Value Answer?
Well then, it certainly seems as if the issue is that you are using the formula as directed instead of understanding how and why such a formula exists. I suggest writing down a cash flow diagram, the associated present value of the payments, and realizing you're summing a geometric series.
Mar
22
comment Can't Get Present Value Answer?
Can you tell us what you did 1 or 2 of those 20 times? If you understand how an annuity is calculated, the solution is immediate, this isn't a tricky problem.
Mar
22
revised Can't Get Present Value Answer?
corrected tags
Mar
1
comment Properties of a transpose
I'd use induction, and the property $(AB)^T = B^T A^T$
Mar
1
comment Properties of a transpose
You don't know A is invertible, so how will the property you listed help you?