how long are short time series worth modelling when does a linear negative regression work what's the difference between positive and negative regression when is a linear regression considered a regression how to find environmental data over time how many variables in a linear regress when can a linear regression be used for a temperature response how many point in a positive linear regression how many variables are there in a regressive regression why is it important to use a linear negative regression how many data points in a regressive model what is the mean value of the variables over an 11 year period how long does a regression need to be to be meaningful what is the average time for a regression how many variables can be used in the regression to determine the response how many data points should you include in an environmental regression? what is the average length of a time series for environmental variables why would you need a linear positive regression model how many data points should be used as a positive model why is a short time series a good idea