Data editing and management: Confidence intervals

Confidence intervals for the measures presented in the report can be found in the linked report tables.

Confidence intervals indicate that if repeated samples were taken and confidence intervals computed for each sample, 95% of the intervals would contain the true value.

Confidence intervals vary for each measure and each demographic breakdown.

Confidence intervals have been calculated using the complex samples package in SPSS, which takes account of design effects.

They are presented for rates (%) in the report tables. Confidence intervals would also apply to the population estimates presented in the report and report tables.

Sometimes confidence intervals cannot be provided, for example when the rate is 100%. In this case the symbol ^ is used.

See the next section for more detail on the other circumstance in which confidence intervals cannot be calculated.

Confidence intervals vary for each measure and each demographic breakdown and will vary from year to year.

Confidence intervals should be calculated using the complex survey package in SPSS, which takes account of design effects.