HW4 example code?
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I'm having issues with Problems 6 and 7 on the homework, namely, neither the arima() call, nor the cross-validation technique are working with multivariate datasets. I can get both sets of code to work if I limit my analysis to one taxonomic group...but with the full matrix it's errors galore. I've done a pretty thorough search for answers on stack overflow, but nothing is coming up. Has anyone found a solution? Am I missing something easy here?
Hi,
First remember that 6 & 7 are optional. The homework is just 1-5. These 2 questions *6 & 7) are more 'open-ended'. There are quite a few different ways you could approach this and you will need to do more coding.
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arima is for univariate models. So you have to analyze Green and Bluegreen time series separately.
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the cross-validation code that Eric showed in class was also for univariate time-series. You'll have to modify it to do the cross-validation for multivariate time series.