is plant type a fixed factor? is height a fixed factor in r how to compare different types of plants time and height r plots how to tell if a variable is a variable in r is height a fixed factor what variable is the height of the different plant types? a random variable for height is why is each plant type a fixed factor is plant type random when calculating a time series which factor is used in r to compare different plant type how to find the time interval for different plant types how to find out if there is a difference between different plant types in r are the different types of plants a fixed factor what is time variable in r and the type factor what is the r value for the plant type in an experiment what is the difference in the height between different type of plant when r uses a random factor in time series how to check if there is a variation between the different plant types in r