linear model

  1. E

    Linear modelling

    Hi, I need some help with a modeling query: I have fit 100,000 linear models: M ~ age + age^2, M is the frequency. I found 2,000 models were significant, but would like to narrow it down to find the most ‘extreme’ cases. Is this possible? Does anyone have any suggestions or any references...
  2. J

    Two effects, but not enough samples - what statistics can I do?

    Dear all, I made measurements of oxygen consumption (VO2) during steady state running with 3 different shoes. The runs were performed in 5 series of 3 runs, where each of the 3 successive runs was performed with different shoes. From the results of VO2 it is seen that the place of the runs...
  3. M

    How to calculate residual covariance in R

    I know it is may be a silly question but I am looking for an answer if I fitted a linear model c<- lm (y~ a+ b) I need to get the residual covariance matrix between traits how can I do that?? Also, if I am fiting a mixed model how do I obtain the residual covariance matrix ??
  4. G

    How can I model a "multiplier effect" in time series data?

    I currently have data corresponding to how often a certain set of songs were downloaded. Each song has a release date, and then the number of downloads per day going forward to today. It would look like...
  5. S

    lm for multiple regression hangs up

    I'm new to R and came over strictly to do a regression on a dataset with 28 variables and 60k entries (excel limits you to 16 variables). I watched some tutorials, read some guides, then wrote this script with the hope that I would easily get the results: mydata2 <-...
  6. N

    Suggestions to improve this sports model?

    Based on the second table "January window spend by place..." in this article, I came up with an LM attempting to determine if, in the English soccer league, there's a relationship between the average season's end ranking in the league table (there are 20 teams, three of which change every...
  7. C

    Correlation?

    Hello all, I have accuracy scores on 6 different tests. I have calculated the percentage of the accuracy in each test so that each of the tests has a score on the same scale (0-100%). I want to see how well do each of the 6 different tests correlate with a 7th test. I have been told I should...