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Apr 29, 2016 12:17 PM
(3491 views)

I am trying to build a transfer function with inventory as input and sales as the output. I build both functions and put the results into the Transfer Function Model Specification dialog where I get a "Transfer function model cannot be fitted. Inputs have missing values" error message. Can someone please advise?

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I checked that immediately. I have already excluded the rows with missing values. I think the problem is in the "Transfer Function Model Specification" input box. I can't figure out what that error could be! Once both models are constructed, shouldn't the ARIMA values go into the Transfer Function Model Specification?

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It seems that some rows of your inventory column have missing values (represented by a dot in the data table), which prevents the transfer function model from working. You might try excluding those rows.

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Does anybody have any suggestions?

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*" Once both models are constructed, shouldn't the ARIMA values go into the Transfer Function Model Specification?"*

You would have to specify the orders of ARIMA for **both** noise series (i.e., the error term of the output series) and input series like this (See JMP documentation for details.Transfer Functions

Also note that there are a few steps preceding to this final model specification as shown below such as pre-whitening and check cross-correlations, etc.

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I have viewed the CO2 example several times. I have read the documentation many times and understand the individual ARIMA functions have to be entered. My problem is I get the "Transfer function model cannot be fitted. Inputs have missing values" error message after I enter the models. I am at a loss!!