All Questions
4
questions
1
vote
2
answers
71
views
which non parametric test to use? friedman or Kruskal?
I am conducting a study on textrual complexity. We fed people food (3 types) over 3 sessions and asked questions about hunger levels. 20 participants were tested during 60 trials in total. Of the 14 ...
- 11
4
votes
2
answers
1k
views
How to create a B-spline basis without intercept and linear trend included?
I want to fit the following model using splines:
\begin{align} Y(t) = \beta_0 + \beta_1t + \sum_{j=2}^{d} \beta_jB(t)_j \end{align}
where $B_j$ are the basis functions. However, when I run the ...
4
votes
1
answer
2k
views
Construct piece-wise linear mixed effect models
I'm looking at the BMACS dataset(data(BMACS)), and is trying to construct a local constant fit without covariates using base functions B1(t) = 1 for t < 2, B2(t) = 1 for 2 <=t <4 and B3(t) = ...
- 163
2
votes
2
answers
5k
views
Log transformation not making data normal
I have a data set with positive skewness when I log tranform it tends to be negatively skewed. Is there any other transformation that I can use or any statistical method works?
Thanks!!!
- 525