Further investigation of whether correlations amongst data are invalidating the conclusion of a statistically significant trend in Antarctic minke body condition over time
| dc.contributor.author | Konishi, K | |
| dc.contributor.author | Butterworth, Doug S | |
| dc.date.accessioned | 2016-04-12T09:34:03Z | |
| dc.date.available | 2016-04-12T09:34:03Z | |
| dc.date.issued | 2013 | |
| dc.date.updated | 2016-04-12T09:32:12Z | |
| dc.description.abstract | A statistically significant decline in body condition in the Antarctic minke whale over the JARPA period was reported in Konishi et al. (2008). Subsequently, however, questions were raised in the IWC Scientific Committee as to whether the model used had adequately accounted for the data structure in JARPA (de la Mare, 2011), i.e. whether neglect of correlations in the data had led to negative bias in the confidence interval estimated for the decline. Earlier a jack-knife approach with year as the sampling unit was used to account for within-year correlations, and showed that while the confidence interval estimates reported originally had been negatively biased, the estimated decline remained statistically significant at the 5% level. This approach did not, however, take account of possible betweenyear correlations. This paper investigates the possibility that such correlations could have biased these interval estimates appreciably. The results show no sign of appreciable interannual auto-correlation, and indicate that the decline reported by Konishi et al. (2008) remains statistically significant at the 5% level. We suggest that his constitutes sufficient statistical evidence to confirm this significance, so that this matter might now be regarded as resolved by the Scientific Committee. | en_ZA |
| dc.identifier.apacitation | Konishi, K., & Butterworth, D. S. (2013). <i>Further investigation of whether correlations amongst data are invalidating the conclusion of a statistically significant trend in Antarctic minke body condition over time</i> University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group. Retrieved from http://hdl.handle.net/11427/18785 | en_ZA |
| dc.identifier.chicagocitation | Konishi, K, and Doug S Butterworth <i>Further investigation of whether correlations amongst data are invalidating the conclusion of a statistically significant trend in Antarctic minke body condition over time.</i> University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group, 2013. http://hdl.handle.net/11427/18785 | en_ZA |
| dc.identifier.citation | Konishi, K., & Butterworth, D. (2013. Further Investigation of Whether Correlations amongst Data are Invalidating the Conclusion of a Statistically Significant Trend in Antarctic Minke Body Condition over Time. In Scientific Committee Annual Meeting 2013 (SC65A). | en_ZA |
| dc.identifier.ris | TY - Working Paper AU - Konishi, K AU - Butterworth, Doug S AB - A statistically significant decline in body condition in the Antarctic minke whale over the JARPA period was reported in Konishi et al. (2008). Subsequently, however, questions were raised in the IWC Scientific Committee as to whether the model used had adequately accounted for the data structure in JARPA (de la Mare, 2011), i.e. whether neglect of correlations in the data had led to negative bias in the confidence interval estimated for the decline. Earlier a jack-knife approach with year as the sampling unit was used to account for within-year correlations, and showed that while the confidence interval estimates reported originally had been negatively biased, the estimated decline remained statistically significant at the 5% level. This approach did not, however, take account of possible betweenyear correlations. This paper investigates the possibility that such correlations could have biased these interval estimates appreciably. The results show no sign of appreciable interannual auto-correlation, and indicate that the decline reported by Konishi et al. (2008) remains statistically significant at the 5% level. We suggest that his constitutes sufficient statistical evidence to confirm this significance, so that this matter might now be regarded as resolved by the Scientific Committee. DA - 2013 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2013 T1 - Further investigation of whether correlations amongst data are invalidating the conclusion of a statistically significant trend in Antarctic minke body condition over time TI - Further investigation of whether correlations amongst data are invalidating the conclusion of a statistically significant trend in Antarctic minke body condition over time UR - http://hdl.handle.net/11427/18785 ER - | en_ZA |
| dc.identifier.uri | http://hdl.handle.net/11427/18785 | |
| dc.identifier.vancouvercitation | Konishi K, Butterworth DS. Further investigation of whether correlations amongst data are invalidating the conclusion of a statistically significant trend in Antarctic minke body condition over time. 2013 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/18785 | en_ZA |
| dc.language | eng | en_ZA |
| dc.publisher.department | Marine Resource Assessment and Management Group | en_ZA |
| dc.publisher.faculty | Faculty of Science | en_ZA |
| dc.publisher.institution | University of Cape Town | |
| dc.subject.other | Antarctic minke | |
| dc.subject.other | body condition | |
| dc.title | Further investigation of whether correlations amongst data are invalidating the conclusion of a statistically significant trend in Antarctic minke body condition over time | en_ZA |
| dc.type | Working Paper | en_ZA |
| uct.type.filetype | Text | |
| uct.type.publication | Research | en_ZA |
| uct.type.resource | Research paper | en_ZA |