Sources of Variation in Survival and Recovery Rates of American Black Ducks

1987 ◽  
Vol 51 (4) ◽  
pp. 689 ◽  
Author(s):  
David G. Krementz ◽  
Michael J. Conroy ◽  
James E. Hines ◽  
H. Franklin Percival
Keyword(s):  
Recovery Rates ◽  
Sources Of Variation ◽  
American Black

Survival and Band Recovery Rates of Sympatric American Black Ducks and Mallards

1987 ◽  
Vol 51 (4) ◽  
pp. 700 ◽  
Author(s):  
James D. Nichols ◽  
Holliday H. Obrecht ◽  
James E. Hines
Keyword(s):  
Recovery Rates ◽  
American Black ◽  
Band Recovery

Effect of Restrictive Harvest Regulations on Survival and Recovery Rates of American Black Ducks

1998 ◽  
Vol 62 (4) ◽  
pp. 1544 ◽  
Author(s):  
Charles M. Francis ◽  
John R. Sauer ◽  
Jerome R. Serie
Keyword(s):  
Recovery Rates ◽  
American Black

Prerelease Stratification in Tag-Recovery Models with Time Dependence

1993 ◽  
Vol 50 (3) ◽  
pp. 535-541 ◽  
Author(s):  
Robert M. Dorazio
Keyword(s):  
Striped Bass ◽  
Statistical Power ◽  
Statistical Significance ◽  
Morone Saxatilis ◽  
Linear Combinations ◽  
Recovery Rates ◽  
Group Interactions ◽  
Average Survival ◽  
Sources Of Variation ◽  
Recovery Models

A statistical model is developed for estimating time-dependent survival and recovery rates of tagged populations that are stratified into groups at release. For populations of fish, the groups might include different sexes or stocks, or they might be distinguished by the location or method of capture. In the model developed here, survival and recovery rates are formulated as linear combinations of parameters that include the effects of time, group, and time–group interactions. Methods of testing the statistical significance of these potential sources of variation are described and illustrated with the recoveries of different stocks of anadromous striped bass (Morone saxatilis). For the striped bass data, elimination of time- and stock-specific sources of variation substantially improved the precision of survival estimates without introducing important bias. During 1988–89 the average survival of both stocks was 0.78 (SE = 0.04). Calculations of statistical power indicate that stock-specific differences in survival of ± 0.2 could have been detected about 50% of the time, given the low rates of recovery and numbers of fish released.

Genetic Sources of Variation in the Gestation Length of the Horse

1951 ◽  
Vol 10 (4) ◽  
pp. 797-806 ◽  
Author(s):  
W. C. Rollins ◽  
C. E. Howell
Keyword(s):  
Gestation Length ◽  
Sources Of Variation

It Takes Two to Make an Interview Go Right: Round-Robin Designs to Demonstrate Interviewer and Witness Variance

2018 ◽  
Author(s):  
Charlotte A. Hudson ◽  
Liam Satchell ◽  
Nicole M Adams-Quackenbush
Keyword(s):  
Grain Size ◽  
Individual Differences ◽  
Individual Difference ◽  
Round Robin ◽  
Investigative Interviews ◽  
Sources Of Variation ◽  
Interview Performance ◽  
Report Accuracy ◽  
Statistical Demonstration

Purpose: Investigative interviews are complex, dyadic, activities typically studied by focusing on developing techniques to improve witness performance. However, in field settings, interviewers are known to vary in their presentation of good interviewing practice. Thus, it is important to conduct research reflective of complex idiosyncrasies in witnesses, interviewers and unique pairings of both. This study explores such sources of variation in an by making use of a 'round-robin' design. Such methodology allows the statistical demonstration of individual difference and unique partner-generated variance in interview performance. Methods: In our study, a total of 45 witnesses were questioned about five real crime videos. After witnessing each event, witnesses were interviewed by a different interviewer (or a computer self-administered interview). In total, nine 'rounds' of interviews occurred, with five new witnesses being interviewed in the same five interview settings (resulting in 225 interviews). After each interview both interviewers and witnesses were asked to complete subjective interview experience ratings. The quality (grain size) and quantity of information in the statements was coded to index witness report accuracy. Results: Principally, the results demonstrate the degree to which witnesses and interviewers affect statement quality, and highlight the influence of unique interviewer-witness pairs. (Participant personality and interviewer behaviour were also analysed, but with limited effects). Conclusion: This study presents the useful round-robin methodology for studying interviewer-witness behaviour. Whilst the current personality and behavioural measures do not account for these individual differences, we advocate this methodology be adopted more widely to better understand interview performance.

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