how to estimate time effect which variable is considered to be a fixed factor what model can you use to find the time effect of randomization of time is time a fixed factor in a mixed model? what is the difference between the random effect of time and time in a mixed model? why is time a fixed variable sss how to determine time difference by treatment time when to use a fixed or variable for the time effect can you use a fixed variable in an sss model what does random effect mean in statistics does spss need to use a fixed factor is time a fixed factor in spss how to find out the time effect of a mixed model when to insert time into mixed model to find the effect? does interval time affect time how to determine the random effect on time for a group of humans in spss how to estimate random effect of time variable using spss when a group is randomized to two conditions what does the rate of the response be for each group in the mixed model mean why does sass use time as variable how to calculate random effects