Abstract
Extract
The paper by HJ Ha, IL Anderson, MR Alley, BP Springett and BD Gartrell published in the New Zealand Veterinary Journal 55, 235–238, 2007, entitled, “The prevalence of beak and feather disease virus infection in wild populations of parrots and cockatoos in New Zealand” contained an error in the formula for the 95% confidence interval (CI) (Statistical analysis, Page 236). The correct formula is: