Detecting trend change in hazard functions—an L-statistic approach

Majumder, Priyanka; Mitra, Manimala

doi:10.1007/s00362-018-01074-8

Cited by 8 publications

(2 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We evaluated trends in linear extension, mean annual (January–December) Sr/Ca‐SST, annual minimum (winter) Sr/Ca‐SST, annual maximum (summer) Sr/Ca‐SST, and seasonality (the difference between the summer and winter extremes) in Sr/Ca‐SST using linear regression analysis over the entire length of the record. We also used the “trendsegment” function in R package trendsegmentR (Maeng & Fryzlewicz, 2023) to evaluate the timing of significant changes in the direction of trends (i.e., inflection points) in the MK1 coral record. We then separately evaluated trends in the data for the periods bounded by the two significant inflection points identified in the analysis (1875 C.E.…”

Section: Methodsmentioning

confidence: 99%

20th Century Warming in the Western Florida Keys Was Dominated by Increasing Winter Temperatures

Flannery,

Richey,

Toth

et al. 2024

Paleoceanog and Paleoclimatol

View full text Add to dashboard Cite

Long‐lived Atlantic coral species like Orbicella faveolata are important archives of oceanographic change in shallow, marine environments like the Florida Keys. Not only can coral‐based records extend for multiple centuries beyond the limits of the instrumental record, but they can also provide a more accurate representation of in situ conditions than gridded interpolated sea‐surface temperature (SST) products for nearshore reef environments. We use the coral Sr/Ca paleothermometer to produce a 150‐year (1830–1980 C.E.) monthly SST reconstruction from an O. faveolata colony collected in the Marquesas Keys, FL, USA. An important feature of our record is a significant 20th‐century warming trend in winter SSTs. We hypothesize that the winter warming trend was driven partially by a decrease in upwelling associated cyclonic eddies spinning off the Florida Current. A long‐term weakening of winter Florida Current transport over the 20th century could be responsible for decreased cyclonic eddy formation in the Florida Straits. Another feature of the record is pronounced multidecadal fluctuations of mean annual warming and cooling in the record, which correspond to Atlantic Multidecadal Variability (AMV), with the AMV lagging behind western Florida Keys temperatures by 5–11 years. Strong coherence between coral‐based SST reconstructions in the western Florida Keys with broader scale Atlantic oceanographic trends over the past century suggests a common driver of regional SST variability.

show abstract

Section: Methodsmentioning

confidence: 99%

20th Century Warming in the Western Florida Keys Was Dominated by Increasing Winter Temperatures

Flannery,

Richey,

Toth

et al. 2024

Paleoceanog and Paleoclimatol

View full text Add to dashboard Cite

show abstract

“…Finally, they conducted simulation studies that confirm the validity of the proposed test and applied their methods to test the change points in the hazard rates of prostate cancer patients. Majumder & Mitra (2019) proposed a test to detect trend changes in hazard functions. The testing problem is 𝐻 0 : constant failure rate vs 𝐻 1 : bathtub shaped failure rate.…”

Section: Constant Hazard Function By Partsmentioning

confidence: 99%