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Danny


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自 2014 起处于活动状态

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统计学

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How to make covariance matrix positive semi-definite (PSD)
I am using the cov function to estimate the covariance matrix from an n-by-p return matrix with n rows of return data from p tim...

10 years 前 | 1 个回答 | 0

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How to concatenate string vectors of unequal length?
If I have thee vectors v1 = {'a' 'b' 'c'}', v2 = {'d'}' and v3 = {'e' 'f'}', how do I create a four vector v4 = 'a' 'd' 'e' ...

10 years 前 | 4 个回答 | 0

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How do you use one vector to name another vector?
If you have three vectors: vect1 = [1 2], vect2 = [4 5], and vect3 = {'name1';'name2'}, how do I name vect1 and vect2 using the ...

10 years 前 | 1 个回答 | 0

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How to read vector of strings into MATLAB?
I have an Excel file with a list of strings in the first column (one string per cell). How do I import the strings into a vecto...

10 years 前 | 1 个回答 | 0

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How to publish table on one line using publish button?
I made a table using the array2table function. When I use the publish button (on PUBLISH tab), the table gets split down the pag...

10 years 前 | 0 个回答 | 0

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How to publish a table and graph?
I have written code that takes a time series and produces a table of the inputs using the function array2table as well as a grap...

10 years 前 | 0 个回答 | 0

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How to make vector of strings into column headers of table
I have a vector of dates: a = Oct_2014 Nov_2014 Dec_2014 and I want to use the array2table function to make a ta...

10 years 前 | 1 个回答 | 0

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How to convert number to string vector
I have three vectors representing years, months, and days: a = [2014;2014]; b = [10;11]; c = [25; 24]; and at the very...

10 years 前 | 2 个回答 | 0

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How to assign a plot to a variable?
How can we assign a plot to a variable such that when we type the variable the plot appears (as opposed to a number or equation)...

10 years 前 | 1 个回答 | 1

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Have MATLAB code pause and then take input from command line
I know 'pause' halts MATLAB code and waits for you to hit 'Enter' before continuing. How can I pause the code, and then have it...

10 years 前 | 1 个回答 | 0

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Why do many MATLAB examples model stock price returns instead of absolute changes?
Many MATLAB examples about fitting ARIMA models use price2ret to transform a stock time series to a return time series and then ...

10 years 前 | 1 个回答 | 0

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Should ARIMA models be used to model stock price changes or returns?
I'm simulating price paths using ARIMA models. Is it best practice to model stock prices through their absolute changes (ARIMA ...

10 years 前 | 0 个回答 | 0

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Why specify intiial variance when estimating a conditional mean and variance model?
In many MATLAB examples where the estimate function is used to estimate a conditional mean and variance model, the examples usua...

10 years 前 | 0 个回答 | 0

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What are MATLAB tests to check predictive performance of a fitted model?
A model that fits data well does not necessarily imply that it will forecast well. I know cross validation is one method for ch...

10 years 前 | 1 个回答 | 0

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How Should Conditional Mean and Variance Model be Changed if Residuals Exhibit Autocorrelation?
I have a time series Y that I know exhibits autocorrelation and heteroscedasticity. Using the estimate function, I fit a condit...

10 years 前 | 1 个回答 | 0

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Causes of Rank Deficiency when Fitting GARCH models
I am fitting an ARIMA(1,1,1) model with GARCH(P,Q) variance to a time series. I use two for loops to iterate though P = 0:3 and...

10 years 前 | 1 个回答 | 0

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已回答
How to assess adequacy of fitted GARCH model?
Hi Roger, Thank you for the reply. What is the name of the textbook you are referencing?

10 years 前 | 0

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How to assess adequacy of fitted GARCH model?
I am curious how to check whether an already fitted GARCH or ARIMA model with GARCH variance adequately captures the data it is ...

10 years 前 | 2 个回答 | 0

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