The subject of this paper was presentation of the properties of the Method 'r', i.e. a method utilizing the sum of the terms of a real time series in calculating the average (mean) of the growth pace (rate). This property permits to use the Method 'r' and its tables as substitute for the Least Square Method in fitting the time series wherever an exponential-type function is to be adjusted to real (experimental) data. The solution of the problem was presented in two variants: a) real initial (basic) term and real sum of terms of the time series in question; 2) real final term and real sum of terms of the time series in question
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