ucm time series what does ucm slang mean what is the definition of an unobserved variable why use an unobserved indices for predicting economic performance? how does the ucm work what kind of indices are used in a time series what is the dependent variable of a time series why do we use ucm when an economic indice is negative, a rate of growth equals how to do trend and seasonality regression with economic indicator what is the economic indice for revenue what is the economic indicator cfnai what is the indices when an economic indices is negative, it is considered above trend when the economic activity is negative, the growth rate is below the trend level. which indices are useful for forecasting growth ulm method to fit model what is the gamma component of the indices why are indices useful when an indice is positive, growth is below trend.