Recent content by noetsi

  1. noetsi

    time series problems

    It is an error about the formatting of the data. What does not make sense here is it gives no error for the whole data set, but gives an error when you use part of the data set. It's the same data set.
  2. noetsi

    time series problems

    I do mydata <- read_excel(file.choose()) mydata<- ts(mydata$Spend, start = c(2017, 7), frequency = 12) and I have no trouble I do mydatatr<- ts(mydata$Spend, start = c(2017, 7), end = c(2021,9), frequency = 12) and I get Error in mydata$Spend : $ operator is invalid for atomic vectors...
  3. noetsi

    design question

    The dependent variable is income two quarters after closure so it has many many values. I can try to build one if that is helpful.
  4. noetsi

    residuals linearity

    I am not sure miner I will find out.
  5. noetsi

    residuals linearity

    The problem I have with it being pronounced is that with larger data sets, this one has thousands, I can't see any pattern. :p The literature I know says that except for non-linearity, regression assumptions impact the standard errors not the effect size. There are issues, such as omitted...
  6. noetsi

    residuals linearity

    Only two of my predictor variables are not ordinal and one is effectively ordinal (the number of counselors is in theory unbounded and interval, but in practice is rarely greater than six). The dependent variable, income, has many levels, but income for this group is low so it might be...
  7. noetsi

    residuals linearity

    There is really two issues here. First which of the many residuals that can be generated to look (this is from SAS). Second, I am trying to detect non-linearity (I tested for multicollinearity and there is none, with 5,000 plus points I don't care about heteroskedasticity or normality). But I...
  8. noetsi

    design question

    If you were in my shoes you would quit and go find a less boring job. Oh and know what to do. :p I have read of but know little about propensity scores. Any suggestions where to start. I have an interval dependent variable, I don't know what you mean by an outcome model.
  9. noetsi

    design question

    We have a service that we are trying to evaluate. We have a dependent variable of income gain. The problem is that those that get the service may vary in many ways from those who don't get the service (most of which we probably don't measure). For instance someone may have a more serious...
  10. noetsi

    Hierarchical regression building support

    Unfortunately the word block is used different ways and hierarchy. To some this means multilevel models, where one effect is nested inside another. But SPSS uses this to mean adding variables at different points in the analysis. First you add some, then you add more, and you run a test if the...
  11. noetsi

    Regression Analysis

    Since all time series is rough I suggest intervention analysis (some call this piece regression). Analyze if the slope changed as result of the interventions. If the change is a pulse, so it occurs than fades away pretty much entirely, or the impact is too gradual this won't work. There are also...
  12. noetsi

    restriction of range

    I have now have a formal test if you are an idiot. Soon to be called the Hellein test. 1) Run linear regression with a single predictor. 2)Request a VIF/Tolerance test. To be safer add a test of collinearity. If you puzzle more than five minutes, as I did, why the VIF/Tolerance value is...
  13. noetsi

    restriction of range

    I am running a regression where the predictor, interval(formally anyhow see below), is how many times a customer had a new counselor. The dependent variable is how much income they earned. The dependent variable has a wide range of values. But there are relatively few levels of the predictor (in...
  14. noetsi

    Standardizing b

    It has been a long time since I worked with this, but I think there is no agreed on way how to standardize a logistic coefficient. There are many ways to do it. Note that even with linear regression there are well known authors who strongly oppose the use of standardized coefficients (although I...
  15. noetsi

    Baffling data entry error

    Do I put the filename in quotation marks parent etc? I use a GUI right now, I just point to what I want it to pull in.