model

  1. C

    What model should I use? Studbook data

    Hi all, I use R and want to analyze a dataset from a studbook that contains information of populations of the same species on different locations. I want to see if there are differences between these populations. The response variables are Lx (survivorship), which is a probability, and Mx...
  2. M

    Regressing regression coefficients against other sets of data

    Hi guys A bit of a background. I am a trader by profession and have moderate knowledge of stats. I am building a model which prices a futures curve out about one year at any point in time. I started by using the dynamic Nelson and Siegel equation (so a trig function to fit my data) and added...
  3. R

    Which ANOVA to use - sum of squares,model,n-way,one-way?

    Hi all, I want to analyse some data using an Anova. The data are one continuous variable (the thing I was measuring) and one categorical variable (the 4 different group numbers), I also have 3 more continuous data which I want to test for effects on my dependent variable. I really just want to...
  4. X

    sparse time forecast

    Hello to All I have a dataset pertaining to 1980 and 2000. Because I have actual value in 1980 (CR80) and 2000(CR00); I want to make a model that is a forecast for the data point in 2000 using the value in 1980. I want to use covariates from 1980 to predict how good the forecast is. What...
  5. K

    regression? model change over time

    Hey all! This is a question about methods. I am really noob but want to learn. If you have a book or papers to suggest that is helpful to! How can you model change over time? Dependent variable: Interest Rate 1980(IR80), Interest Rate 2000(IR00). I have these for many institutions. Can a new...
  6. G

    Tobit model

    Hello, how does the Tobit model treat censored dependent variable data? I have a dataset with zeros that actually stand for non-zero but missing observations. Which is why I don't want them to be viewed as zeros. How does Tobit apply to this?
  7. P

    No collinearity between dependent and exogenous variables - Implicatrions

    I'm trying to test for autocorrelation in the residuals of an AR(p) model. The stata output is: "the exogenous variables may not be collinear with the dependent variables, or their lags" and no results. Can I conclude from this that the residuals are not autocorrelated? Thank for answering...
  8. S

    step change

    Fir a step change model, is it a linear model ?
  9. T

    Why would an attribute in a data set not be included in a generated decision tree?

    Say I have a data set of customers with information such as bank account, age, telephone, credit history, emplyoment, etc... How could when I used RapidMiner, that some attributes are not in the generated decision tree such as telephone or age? What could be the verious reasons for this?
  10. G

    developing a statistical prediction rule for success

    Hi, My boss is looking for me to analyze data that we have an past projects and develop a "formula" that will tell how likely a future project is to be a success. We have defined what a success is, so looking at the past data I can find statistics on when projects are successful. Now comes...
  11. J

    confusion on terminology

    I could use some confirmation or correction on something basic that has been confusing me for a while. It has to do with "normal" and steps in modeling. Normality is for residuals (people already helped me with this in a previous thread) and this comes after fitting a model. In the beginning of...
  12. P

    ANOVA Design and Analysis

    Hello, This is my first post so I hope my question is appropriate for the group. I have performed an experiment where we have blood samples from 18 donors (subjects). The blood from each subject is split in 2 and subjected to a treatment (factor A, 2 levels). Each of these samples is...
  13. H

    Help on a project!!!

    I am doing a school project and trying to find a relationship between government deficit/GDP (dependent variable) and inflation, interest rate, employment rate(three independent variable). After I did some test in gretl, the linear regression model passed REMSEY test for non-linearity, but...
  14. R

    diet treatment model

    Hi all I have an experiment for growth with fishes and diet treatment´s in differents tanks... I have differents diets (8) in 24 tanks, each diet in triplicated, i want determinated the tanks and diet effects. I had use genstat and spss for calculate them, but i have some comfussion how...
  15. J

    Help with attribution/causality

    Hello everyone! I am new to this forum, but excited to become more involved :tup: I am currently a mathematics/statistics student and I am looking for some ideas on how to proceed with some of my summer research. I hope I posted this in the right forum, if not, sorry! I have recently...
  16. K

    ANOVA R code for generalized randomized block design

    Does anyone know how to write R code for an ANOVA using a generalized randomized block design? I have two blocks (random) and three treatments (fixed) each with two reps at each block. I know the RCBD code is aov(object~Block*Trt), but I'm not sure how to specify the error term for the GRBD.
  17. R

    Significance of rankings of random choices

    I have 30 options of food (10 fruit, 10 vegetables, 10 meats), and ask respondents to rank (most favorite to least favorite) 4 randomly selected choices from those options, but always 1 meat, 1 veggie, and 2 fruits. How do I determine statistically significance differences of total most favorite...
  18. R

    glm link function HELP! To gaussian, or not to gaussian, that is the question...

    Please ignore question no longer need help - thank you for all of your responses!
  19. L

    inferences on deterministic models

    Hello, Please let me know if I am posting in the wrong place. Thanks I am working on a project where I have a mathematical epidemic model and I have some data. I want to use statistical methods to find the model that best fits the data. So I have a very deterministic model and need to...