1. S

    Derive an equation for the relative error of V if the errors of c1 and c2 are known

    Hello, I am having a problem figuring out a solution to the following and would be very grateful if anyone can help: Different concentrations c1 and c2 of an ion of charge q across a cell membrane lead to a voltage difference V , where V=(kT/q)*ln(c1/c2) Derive an equation for the relative...
  2. T

    Need help with logarithmic equation

    Hi, I have some time pressure to complete this equation and find x. Any help is hugely appreciated. Picture attached.
  3. M

    Structural equation modeling - predictor measured in different group

    Dear all, I am kind of stuk on the following problem: what if you would like to create a model, with several predictors. only one important predictor is measured in a different sample. The characteristics of this sample are similar. for example, you would prepare a model to describe a...
  4. H

    ANCOVA: how to recreate equation based on SPSS output?

    Hi all, I performed an ANCOVA with 3 covariates (Analyze>GLM>Univariate…). I would like to use the output that SPSS provides to calculate the adjusted values for my independent variable for each individual. I am trying to do this by figuring out the equation that SPSS uses to calculate the...
  5. C

    Estimate the coefficients of an equation system - can I use OLS?

    Hi! I have not worked so much with this type of regressions and have tried to find the answer in my econometric books and on internet, but have unfortunately not had any luck. I appreciate all help I can get with this! Im using time series data to measure the rate of return of the inputs...
  6. trinker

    Better way to display indicator function.

    I have an indicator function I am displaying in an R manual. I am trying to make it as one line (and more readable) so it looks good in the HTML version of the R documentation. I'm looking to make the current function more streamlined. Dason did this for me previously using max, but I don't...
  7. S

    Representing a MLR equation on its matrix form

    Hi everyone, So my teacher was showing us how to find the B coeficients of a Multiple Linear Regression equation (Bo+B1x1+Bnxn) using matrixes and he told us to use this chart to represent the equation in the matrix form but I don't understand how to use it. Supposedly, with this chart you...
  8. S

    Mathematical equation to the R code

    Hi all, I'm pretty new to R and not a statistics expert. I'd be very grateful if someone could help me with the following question: I'm using the following R code for the calculation of a varying intercept, varying slopes LMER model: > Model.2004 <- lmer(var1 ~ var2 + var3 + var4 +...