Richard Telford’s Blog
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Tag Archives: REDFIT
Lasers, biomarkers and the Sun
The earliest work on Holocene palaeoecology focused on megafossils such as Pinus stumps. Then macrofossils such as hazel shells were used to reconstruct species distributions and climate. Then pollen analysis became important, complementing rather than supplanting the larger fossils. The end of this progress towards smaller … Continue reading
Posted in climate, Novel proxies, Peer reviewed literature, solar variability
Tagged REDFIT, sapropel, Wörmer et al
1 Comment
Sun-kissed Skeletonema costatum? Patterson et al (2013)
This is part of my critical review of the palaeoenvironmental evidence for the influence of solar activity on climate. Patterson et al (2013) have a new paper that reports evidence of the 11-year sunspot cycle on diatoms and sediment characteristics in a … Continue reading
Posted in climate, Peer reviewed literature, solar variability
Tagged Patterson et al (2013), REDFIT, Skeletonema costatum, varves
1 Comment
REDFIT’s rule of thumb
Because REDFIT tests many frequencies, some are likely to appear statistically significant just by chance — a classic multiple testing problem. Schulz & Mudelsee (2002) “follow Thomson (1990) and select a false-alarm level of (1-1/n)*100%, where n is the number of data points … Continue reading
REDFIT & false alarms
REDFIT is a useful tool for palaeoecologists who like to test their data for periodicities as it uses the Lomb-Scargle Fourier transform which tolerates unequal time intervals and so avoids the problems inherent in interpolating data to equal intervals. Several of the papers reporting the … Continue reading
Musings on Quantitative Palaeoecology 