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Jul
21
comment Expected value of the minimum of a non-negative random variable and a constant
I didn't know about the use of CDF for calculating the expectation of a non-negative r.v. For the convenience of those like me out there, I just add here the link to a related answer: math.stackexchange.com/questions/64186/…
Jul
20
comment Expectation of $\min(X, c)$ for $X$ truncated r.v. and $c$ constant
@wolfies I was not aware of the difference between truncated and censored, thanks for the clarification.
Jul
20
comment Expectation of $\min(X, c)$ for $X$ truncated r.v. and $c$ constant
@dsaxton so if $X$ is continuous we have $E(X;X\leq c) = \int_{-\infty}^{c}x\cdot f(x) dx$ whereas if $X$ is defined over the interval $[d, c]$ we have $E(X;X\leq c) = \int_{d}^{c}x\cdot f(x) dx$, right?
Jul
20
revised Expectation of $\min(X, c)$ for $X$ truncated r.v. and $c$ constant
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Jul
20
asked Expectation of $\min(X, c)$ for $X$ truncated r.v. and $c$ constant
Dec
20
awarded  Caucus
Oct
22
comment Check if intervals overlap
@knedlsepp yes, you are right, the condition (*) is not correct. I should use condition () also for each couple $(i,j)$, not only over the whole set $A$.
Oct
22
asked Check if intervals overlap
Jul
2
awarded  Curious
Feb
1
comment Is there a name for this type of optimization problem?
There is a typo in the second constraint: $b_1 \cdot x_2$ should be $b_1 \cdot x_1$, shouldn't it?
Jan
28
revised Highest (lowest) index of positive time-indexed variable
edited tags
Jan
28
revised Highest (lowest) index of positive time-indexed variable
Edited tags
Jan
28
comment Transportation problem in supply chain
I do not understand what do you mean by "to solve transportation problem with only members in the chain" and "with multiple members in the chain". For what I get, this is a classical transportation problem where you have finite capacity at each site. You may want to define the flow from each origin to each destination on each level, keeping the capacities and the demands into account (Hint: $x_{ij}$ is the quantity from $i \in \{1,2,3\}$ to $j \in \{A,B,C\}$).
Jan
28
asked Highest (lowest) index of positive time-indexed variable
Nov
16
comment Converting if else constraints into linear ones
Just out of curiosity, in what kind of problem are you using that constraint? what are you representing, if I may ask?
Nov
15
awarded  Organizer
Nov
15
revised Converting if else constraints into linear ones
I suggest to add the mathematical-modeling tag
Nov
15
suggested approved edit on Converting if else constraints into linear ones
Nov
14
revised Converting if else constraints into linear ones
added 4 characters in body
Nov
14
answered Converting if else constraints into linear ones