RTV Theory and Practice - Special Issue

134

which translates the broadcast identified into a time interval (the least being fifteen minutes) and if the interlocutor states that he has Ustened to a broadcast which lasted, for instance, ten minutes, a whole fifteen-minute interval is recorded. This means that certain imprecision is tolerated, and this nearly always relates to broadcasts whose duration is extremely short (a few minutes long). The respondent’s statement on having Ustened to or viewed a broadcast is considered truthful in that from the moment of Ustening or viewing only a day has passed before the respondent is puestioned, so that the тетогу factor is reduced to the minimum. One basic principle rules in this research; we ask what was listened to and record when it was Ustened to, we ask today, and reconstruct the interlocutor’s attitude to the radio programmes of the previous day. This, then, means that DB information yields not only the number of Usteners of individual programmes but also the total of persons who have realized a minimum of fifteen minutes of contact with the programmes broadcast by Radio Belgrade, some local or other (RepubUc or foreign) radio stations. In table 1 we show the number of people whose households are equipped with radio sets and the number of those who stated that they Ustened to the radio the previous day. Since the figures are assessed from a sample each contains an inevitable error by which the precision of the assessed aggregate or proportion is measured. A model of the sample is apphed which enables the data to be expanded to cover the whole basic set so that they are shown in thousands.