I fit a complicated model in proc glimmix with 2 categorical variables (6 and 8 levels respectively) and the linear and quadratic form of a continuous variable with all interactions.
The 3-way interaction is significant and I want to isolate the regression models for each combination...
I am still working on the same data and I have a question about the residual plots. Everything looks good (histogram, QQ-plot and box-plot) apart from the fitted vs residual plot (top left). I have tried many different models and I keep seeing this tilted rectangle.
Thank you both for the replies. There are only a handful of zeros. I can add +0.0001 to every value so I won't loose any datapoints when using log transformation. I was using glimmix to fit a beta distribution when I converted everything to (0-1) range. I will try proc mixed too.
I am working on a difficult (for my abilities) dataset. The dependent variable is continuous [0-3] bounded and was measured between 2000 to 2019 in several locations (not necessarily the same location in each year). So I have a spatial component that would like to account for.
I have data with many missing observations in an excel file. Missing cells have a period ".".
When using proc import, the "." is recognized as a level in subsequent analysis.
However, when I paste the data directly in SAS, the "." is correctly identified as missing value.
I have a split-plot design and I want to test the effect of 2 factors on the disease incidence (continuous proportion). I am using Beta dist. which is appropriate for these data (bounded within 0-1).
The fit statistics look OK (Pearson Chi-square/DF close to 1)
Fit Statistics for...
Thank you hlsmith for your thoughts and interest on this. I will try to email the author of the book, there is no reply to my post on SAS Communities.
The std error for LSMEANS is 1.01 (p-value=0.0197) and for the BLUP is 0.83 (p-value=0.0005). The issue is that in another dataset, the...
I need to know why they are different. If the above BLUP estimate is the inference across the 5 locations, what is the LSMEANS then?
Don't LSMEANS take into account the random effects and produce estimate of fixed effects across the 5 locations? That is what I thought.
So which one should I...
Thank you hlsmith.
I will read it thoroughly because I really need to understand the difference.
It appears that LSMEAN compute the treatment effect across locations differently than the ESTIMATE (BLUP). I don't think I am doing something wrong, I follow the examples in chapter 6 in SAS for...
I am analyzing data from a multi-location trial (5 locations) to test the effectiveness of a treatment with 2 levels.
The design is RCB with 3-4 replications in every location.
I use the model below:
proc mixed data=mydata;
class location rep trt ;
model Y=trt/ddfm=kr2 residual...
I have a 5 x 5 Latin square design which is replicated 5 times within each location (same rows and columns in each location). The same design was used in 10 different locations and I was asked to perform a combined location analysis.
I have done it before with other designs, such as RCB...
I have data from 200 similar studies, all measuring the same effect of a continuous independent variable on the same continuous response. I say similar because the designs are different (split plot vs. rcbd) and the levels of the independent variable is not the same across all studies.