Recent content by Charlotte87

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    Power calculations to get sample size needed to run an experiment

    Hi everyone! I am writing a paper in development/experimental economics concerning how household bargaining power (i.e. how much say the husband and wife has about how to spend household income) affect how much money is spent on children. I am going to conduct an experiment and is now in the...
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    BLUE (best linear unbiased estimator) in practice

    Homework Statement Let the linear model be Y_{i}=\alpha + X_{i}\beta + \varepsilon . Let the assumptions of the linear model hold. Suppose that the fixed values of X in a data are as follows: X_{1} - 1, X_{2} - 2, X_{3} - 3, X_{4} - 4 . An econometrician proposes the following estimator to...
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    What is the explicit solution for the DSGE model with one unique solution?

    Homework Statement I have understood the point with the Blanchard Kahn condition, my problem is to find the explicit solution when I know there exists one unique solution to the problem. The problem comes from a DSGE model. Homework Equations \begin{pmatrix} p_{t} \\ m_{t} \\...
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    Log-linearizing optimal price in New Keynesian model

    Homework Statement I am going to do a log-linearization around a zero-inflation flexible price steady state of: \frac{P_{t}^{*}}{P_{t}}E_{t}\sum_{k=0}^{\infty}\theta^{k}\beta^{k}C_{t+k}^{1-\sigma}\left(\frac{P_{t+k}}{P_{t}}\right)^{\epsilon-1} Zero-inflation flexible price steady state...
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    Maximizing C_t with Lagrangian: First Order Condition Explained

    No, I have to admitt I've never heard of it...
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    Maximizing C_t with Lagrangian: First Order Condition Explained

    Homework Statement Maximize C_{t} for any given expenditure level \int_{0}^{1}P_{t}(i)C_{t}(i)di\equiv Z_{t} The Attempt at a Solution The Lagrangian is given by: L = \left(\int_{0}^{1}C_{t}(i)^{1-(1/\varepsilon)}di\right)^{\varepsilon/(\varepsilon-1)} - \lambda...
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    Macroeconomics: Overlapping Generation model and lump-sum taxes

    Homework Statement Suppose an individual born at time $t$ maximizes life-time utility \begin{equation*} \max \ln(c_{1,t}) + \frac{1}{1+\rho}\ln(c_{2,t+1}), \; \rho>0 \end{equation*} subject to the budget constraints in periods t and t+1, respectively \begin{eqnarray} c_{1,t} +...
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    Calculating the mean and variance from a moment generating function

    Of course. Then var(X)=E(X^2)-(E(X))^2 =k^2+2k-k^2=2k. Thank you!
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    Calculating the mean and variance from a moment generating function

    Homework Statement Assume that X is squared-Chi-distributed, which means that the moment generating function is given by: m(t)=(1-2t)^{-k/2} Use the mgf to find E(X) and var(X) The Attempt at a Solution I know that m'(0)=E(X), and m''(0)=var(X). So I find...
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    Finding the pdf of a random variable which is a function of another rv

    Homework Statement Let f(x)=x/8 be the density of X on [0,4], zero elsewhere. a) Show that f(x) is a valid density and compute E(X) b) Define Y=1/X. Calculate E(Y) c) Determine the density function for Y The Attempt at a Solution a) is just really basic. I've solved that one. b)...
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    Identifying Potential σ-Fields: Exam Practice Exercises

    Thankyou very much. This has been very helpful!
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    Identifying Potential σ-Fields: Exam Practice Exercises

    Your right, I have been confusing it with the intersections. So, the union of all these things will be {A,B,C}, right? and that should of course be a part of the larger set.
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    Identifying Potential σ-Fields: Exam Practice Exercises

    Sorry, my mistake, it should be {B,C}, not {A,B}.
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    Identifying Potential σ-Fields: Exam Practice Exercises

    Well, I believe so. The complement of the empty set is {A,B,C}. The complement of {A,B,C} is the empty set. The complement of {A} is {B,C} The complement of {B,C} is {A}, Am I missing something?
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    Conditional probability exercise

    I have some problems getting conditional probability right... Does this look like it should? Homework Statement Assume that there are bags of tulip bulbs in the basement, ant that they contain 25 bulbs each. yellow bags contain 20 yellow tulips and 5 red tuplips, and red bags contain 15 red...
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