"Data has less than 10 timestamps" when using 3000+ data points with Neural Network NARX tool?

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skahri1429 2015-10-4

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回答： Greg Heath 2015-10-8

I'm trying to use stock data from Yahoo in the Neural Network Time Series tool (ntstool). I have the original spreadsheet attached titled "Stock Prices Yahoo CSV". I'm trying to predict closing prices, so I created a new document with only that column's information (attached as "Sheet 1-Table 1-1"). I imported this data into the wizard, selected NARX, and on the Select Data screen I imported that data.

Now for the problem: I'm getting an error saying that the data has less than 10 timestamps. I imported over 3000 data points, which is clearly greater than 10. There must be something I'm doing wrong, or that I'm interpreting wrong, but I can't seem to figure it out. Below is a screenshot of the problem.

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Answer 1

Walter Roberson 2015-10-4

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I suspect you should be using matrix column rather than cell column.

I notice you seem to be using the same input variable "data" for both timeseries and target; I'm not sure that is correct. It might be, but it looks suspicious.

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skahri1429 2015-10-5

It let me advance once I selected Matrix row, but I don't understand why. I'll see if I get acceptable results once I run through this a couple of times. If you could help me understand why it worked, that would be great; otherwise, thanks for your input!

Walter Roberson 2015-10-5

Have another look at the screenshot, on the right hand side. Notice that it describes "data" as being 1 sample of 3473 elements, so it thought you only had one timepoint with lots of components. When you select Matrix Column it knows to treat it as 3473 time points of 1 element.

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