Recent content by noetsi

  1. noetsi

    How serious are violations of regression assumptions

    No I don't have access to the program. You post information to it and it spits back results. I confirmed it does not test the regression assumptions.
  2. noetsi

    How serious are violations of regression assumptions

    I think the answer, we have not got a response to this yet, is that it makes no test of any type. It gets data, it runs linear regression, and it spits out results. There are no test of anything. I am not sure, in practice not theory, of how serious a threat this is to the conclusions. Many of...
  3. noetsi

    How serious are violations of regression assumptions

    We are considering getting a tool which runs linear regression without checking the assumptions of the method (the tool is automated, it generates linear regression based on data you put in including generating the report). The problem is that the tool does not check any regression assumptions...
  4. noetsi

    Stablility and serial correlation test for vector autoregresive models.

    One of the key features in vector autoregressive models is choosing lag lengths. A common way to do this is to use a criteria such as AIC or BIC. Often these disagree on which lag to choose. The author I am reading on VAR models suggest "stability test" and "serial correlation" test to chose...
  5. noetsi

    Comparing Actual to Budget

    You could use a MAPE as well I would think although that is used normally in time series or finance. MAPE can be done in excel, I can send it to you if you like. It basically is looking at forecasting error, but I think that is what you are doing really. It will treat each period separately...
  6. noetsi

    What product is proc iml part of.

    No the SAS rep looked at the wrong license. We never got it in the first place. I am not sure we can use it enough to justify. Its major use appears to be in simulation - and they have limited interest in that where I work. I spend most of my time reading not using statistics. Its a strange...
  7. noetsi

    What product is proc iml part of.

    The SAS rep made a mistake. We did not have it on our license. I ran it in both regular SAS and EG although there is no difference.
  8. noetsi

    Controlling for national wages

    I can get the values but I am not trying to standardize in that regard. It is already a ratio (our level/their level). I just need to adjust for the differences in labor markets between the US and Florida. That is a form of standardization I guess. This is what I am talking about. Say our wages...
  9. noetsi

    Controlling for national wages

    In this case I am not running a regression model. I am trying to adjust our number to address differences between our state and the nation. I have our ratio of customer wages compared to other VR customer wages and I am trying to adjust it for the difference for wages generally in our state...
  10. noetsi

    Controlling for national wages

    Not a statistics problem in the classical sense but I could use help on this. Our wages (I work for VR) for our customers are below the national average. I think this is largely or entirely due to the fact that wages in Florida generally are lower than other states. Which drives our customer's...
  11. noetsi

    What product is proc iml part of.

    SAS said we have this already but I ran code using it and the response was the procedure was not found. This is what we have. ---Base SAS Software ---SAS/STAT...
  12. noetsi

    Vector Autoregressive Models

    For impulse response functions you can generate simple ones, or orthogonal ones, or cumulative ones. I understand the theoretical difference. What is the practical difference?
  13. noetsi

    Arima fitting

    the rule of parsimony suggests using the simpler model. When you run the more complex model the parameters may not be statistically significant
  14. noetsi

    Vector Autoregressive Models

    Well the type of models we are talking about have multiple lags built into them.
  15. noetsi

    Vector Autoregressive Models

    Since I can no longer figure out how to rename this thread, I am changing the topic to vector autoregressive models. Is Item Response Functions and Variance Decomposition limited to structural models or can you apply it to recursive models that set no limits on parameters.