Results of the Survey on ICT Usage by Households and Individuals in the Czech Republic 2004
TECHNICAL NOTES | Contents |
1. Table part
Generally in the whole table part, sums lower than 10 thousand persons are considered as data with very low reliability. Data lower than 10 thousand persons are not published. Instead of them there is a dot in the tables and for cases where the existence was not identified at all there is a slash in the tables.
2. Estimates of confidence intervals
Sample surveys are usually connected with sampling and non-sampling errors. The latter are a result, for instance, of administrative drop-outs of dwellings out of the sample, intentional non-response or errors produced by filling in the questionnaire. With these errors, one cannot determine a deviation of estimate without rather wide knowledge of the basic sample. On the other hand, the sampling errors, which arise by applying characteristics of the sample to the basic sample, can be interpreted by means of confidence intervals. The confidence intervals are intervals determined around the estimate in such a way that the actual value of the estimated characteristic falls right within this interval. Constructed most frequently for estimates are the confidence intervals of 95 % - i.e. an interval, in which the actual value of the estimated characteristic can be found with 95 % probability.