# Chris Herdelin

### U.S. Department of the Treasury

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I am a graduate of West Texas A&M University where I earned an M.S. in Financial Economics. I am currently doing post Master's work in Applied Economics at Johns Hopkins University's Zanvyl Krieger School of Arts & Sciences. In addition, I am an economist at the U.S. Department of the Treasury and Adjunct Professor of Economics at Ursinus College. I will be pursuing a PhD in Economics in the Fall of 2021.

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Question

I am trying to solve the system of two linear differential equations and create a phase diagram to asses the stability of the system.

\dot{\dot{y}\ =-\delta\gamma\beta(y-y_n)-\delta\gamma\lambda(p-p_t)} \dot{\dot{p}=\alpha(y-y_n)}

3 månader ago | 2 answers | 0

### 2

answersQuestion

I am not sure how to code the ARMA models below.

For each ARMA model below, show how an unit shock (i.e.,1) to X at t (i.e., et =1) affects Xt+i, for i=0,1,2,3,…. Xt = 0.7Xt-1...

nästan 3 år ago | 0 answers | 0

### 0

answersQuestion

How do I calculate the R^2?

n=100; alpha=1; beta=1.5; e = randn(n,1); x=rand(n,1); y=alpha + x*beta + e; x=[ones(n,1), x]; bhat = inv(x'*x)*x'*y; di...

nästan 3 år ago | 1 answer | 0

### 1

answerQuestion

How do I Run the below program? The sample program sums various column vectors. How do I Modify the first of the program (i.e., ignore the xsum2part) to calculate averages.

x=[1;2;7;5;9;3;6;9;1;11;1]; xsum=sum(x); xsum1=0; for i=1:11 xsum1=xsum1 + x(i,1); end disp xsum; disp(xsum); disp xsum1...

nästan 3 år ago | 1 answer | 0

### 1

answerQuestion

How do I run the program below in Matlab? b) How do I extend this program to calculate the R2 of this regression? How do I calculate the covariance matrix of the OLS estimator

n=100; alpha=1; beta=1.5; e = randn(n,1); x=rand(n,1); y=alpha + x*beta + e; x=[ones(n,1), x]; bhat = inv(x'*x)*x'*y; di...

nästan 3 år ago | 0 answers | 0

### 0

answersQuestion

How do I input the following commands in Matlab?

% a simple matlab program with matrix commands x = [1 2 3; 4 5 6; 7 8 9]; disp x; disp(x); y = [11 22 23; 14 15 16; 17 18 19...

nästan 3 år ago | 1 answer | 0

### 1

answerQuestion

AR(1) Model

How do I estimate the attached model using Maxmimum Likelihood? Any help you could give me would be greatly appreciated!

ungefär 3 år ago | 1 answer | 0

### 1

answerQuestion

Incorporating Multiple Dummy Variables In A Regression Model

I was able to incorporate Dummy2008 into the regression model, but including all four dummies resulted in the error below. How d...

mer än 3 år ago | 1 answer | 0

### 1

answerQuestion

Dynamic Macro Script for Matlab

How do I script the Solow Model attached in Matlab? Specifically, how do I code the endogoenous as well as the exogoeneous vari...

mer än 3 år ago | 0 answers | 0

### 0

answersQuestion

Manual Weighted Least Squares Estimation

I have estimated WLS manually by dividing each of the coefficients by income^0.5. My question is, when I do that, does it automa...

ungefär 4 år ago | 1 answer | 0

### 1

answerQuestion

Polynomial Distributed Lag Model

Can anyone tell me how to create a Polynomial Distributed Lag Model to deal with Multicollinearity in Matlab?

ungefär 4 år ago | 0 answers | 0

### 0

answersQuestion

Having Trouble Using The collintest!

>> collintest(Q) Error using svd Input to SVD must not contain NaN or Inf. Error in collintest (line 254) [~,S,V] = svd(XS...

ungefär 4 år ago | 1 answer | 0

### 1

answerQuestion

Opening Multiple Windows To Analyze Different Plotted Variables

How do I open separate windows for each time series variable that I am plotting? When I plot a new variable it erases the plot o...

ungefär 4 år ago | 1 answer | 0