0 produced or happening every three months -- kwartalny, co kwartał
Water and electricity bills are paid quarterly.
The use of seasonal dummy variables to filter quarterly and monthly time-series data is very popular in econometric applications.
The quarterly value is the value of the last month of each quarter.
The choice of cut-off points in the quarterly analysis is designed to highlight any postelection surge in command changes.
Table 1 shows the means and standard deviations and certain percentile values for weights of males at quarterly intervals to 4 years of age.
We augment the order of this process up to four to allow for seasonal productivity shocks in a quarterly economy.
Although we found no relevant changes in this latter case, we noticed some interesting differences when quarterly data are used.
We measure the quarterly stock of durable goods as the average of the end-of-quarter stock and previous end-of-quarter stock.
In particular, 1981 is the only year of instability for both the annual and quarterly data.
