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  1. noetsi

    Trouble connecting to R

    I will ask their help. I already know what they will say. :) The same thing they do when I ask them SAS related questions. But I have nothing to lose. Dason I think you misunderstand what I am saying. I am sure it is a network issue due to the change in networks and possibly the VPN. I am...
  2. noetsi

    Multilevel Models

    [Jake]Technically speaking, you could estimate a random variance for as little as 2 areas. Do you have any particular reason to believe 7 would be too few? [Hlsmith]You only have 7 clusters, and it is generally true that it is a somewhat small number of clusters, which can, thus, lead to biased...
  3. noetsi

    Multilevel Models

    The way I interpret this is if you group center the data you will eliminate all bias tied to groups (ignoring SE issues). "Another way is to include the group-mean centered level one variable, also known as centering within context (CWC). If the researcher is interested in the association of...
  4. noetsi

    Multilevel Models

    I always find these types of comments distressing. If high level statisticians disagree with each other, how do mere mortals such as myself know what is correct. "General and specialized multilevel modeling software, both free (e.g., R) and commercial (e.g., HLM and SAS), are readily available...
  5. noetsi

    Trouble connecting to R

    IT could care less about R. That is why I am not talking to them. I had to fight with IT long ago to even get R. I am the only one in my entire division who likely uses R. I am talking about simple stuff dason. When I do a library statement or import data into R it runs very slowly compared to...
  6. noetsi

    Multilevel Models

    I am not sure what this means. That if you grand center the level 1 variables, or don't center them, you have to group center the level 2 variables? "When using the predictor in the raw scale or within grand-mean centering, it is critical to include the group means of the predictor at Level 2...
  7. noetsi

    Multilevel Models

    I try to write down in my tomes when Jake answers something (you to). So my tome says Jake said.... :) I don't think he answered this one, he did address other issues in MLM. For dummy variables, and some don't agree, this is what one professor wrote for his class. "Note that while it may seem...
  8. noetsi

    Multilevel Models

    I start using this 7 years after I studied it, when I have largely forgotten the method. I have lots of questions but to start with, there seems to be disagreements on whether you should center you predictors at the lower (individual) level or not. And if you do, should you use group or grand...
  9. noetsi

    Trouble connecting to R

    I am pretty sure it is saved to my C drive. What I meant is it ran much faster before when I used the state connection rather than through a VPN to that (the state wireless has no VPN to go through). This occurs for other things, but is worse with R than most.
  10. noetsi

    Trouble connecting to R

    It appears that the functions and building on imported data work fine. But running library statements or importing data is slow.
  11. noetsi

    Trouble connecting to R

    My office closed and we now work from home. I connect through a VPN (it is a state computer and there are serious concerns with security). My internet connection, which used to be the state one now turned off, is in practice 60 megs down (in theory 100 but it never is) and 5 up. Things are a bit...
  12. noetsi

    How to interpret the coefficients of the time dummies in a fixed effect model?

    A fixed effect model can mean many things. What type of regression are you using. How is time defined/measured in your model? Generally speaking understanding time effects is very difficult and requires specific types of regression if non-stationarity is involved which likely it is in real world...
  13. noetsi

    Control group

    If they got a job or not, income gains. We are unable to do random assignment.
  14. noetsi

    Rookie finance question: standard deviation

    I am skeptical that anyone can predict stock prices perfectly. If they could given the incredible amount of money that could be gained they would have done this already - and wouldn't talk about it since then others would do so as well. I think the general agreement is that stocks are...
  15. noetsi

    Relative impact

    In this case as an interval variable although I have dummy DV as well. I don't have a hold out data set. I am not familiar with bayes or partial R squared. I will look that up. I almost never use Baysian approaches.
  16. noetsi

    Hello everyone

    In my humble experience work places have little use for statistics. Which of course I regret
  17. noetsi

    Relative impact

    Say for OLS regression. Say you get asked which of these variables have the most impact on the dependent variable. So you can rank the predictors from most to least influence. Say most of the predictors are dummy variables but some are not. Is there a good way to do this? In a decade plus I have...
  18. noetsi

    Outliers

    There are no agreed on way to detect outliers, or rather there are many which are not agreed on. You can look at specific values of standardized or studentized residuals, I think the rule of thumb is 3 or greater but you can look this up. There are also rules for when Cox distance matters, again...
  19. noetsi

    Main effects vs. interaction - what comes first?

    I have not, but most likely you would in a journal. My research was not in statistics.
  20. noetsi

    Main effects vs. interaction - what comes first?

    I have read that main effects have no meaning when there is interaction. Or can not be interpreted easily anyhow. But that has nothing to do with how they are reported. How they are reported is a style not statistical issue.