Sentences with phrase «calibration curve»
A calibration curve is a graph or a mathematical model that helps us understand the relationship between the measurements we observe and the quantities we want to know. It allows us to accurately determine unknown values based on known measurements. Full definition
However, I'm not convinced that his treatment of calibration curve uncertainty is noninformative even in the absence of it varying with calendar age.
climateaudit.org
Results from each aliquot were plotted by the software onto a simultaneously run calibration curve generated from known quantities of DYS14.
Provided we know the size and shape of the error in that original reading (Normal, log Normal etc) we can generate a spread of random values around our actual reading reflecting what it might be, and then for each of those read off the age that implies, using a table that randomly selects from the (smeared out) calibration curve at that value.
The SRLR method sets its 97.7 % bound at two standard deviations above the radiocarbon determination, using the exact calibration curve to convert this to a calendar date.
I had a Savina placenta sample which of course was miles out of the standard solutions calibration curve range, and using the equation for the line got a result.
This allowed absolute quantitation to be achieved with an external calibration curve generated from standards containing the same fixed concentration of propranolol - d7 and varied concentrations of propranolol.
Calibration curves correlating this ratio to the total expression time can therefore be used to determine how long a pool of FP timers has been expressed, either in whole cells or as a pool of fusion proteins localized to a specific region of the cell.
The direct date of the fossil (39,700 ± 1,100 14C BP) is in good agreement with the probability distribution function, indicating at a high level of probability that Neanderthals did not survive at Mezmaiskaya Cave after 39 ka cal BP («calendrical» age in kiloannum before present, based on IntCal09 calibration curve).
An additional 2 aliquots from each specimen were tested for the beta - globin gene (present in two copies per cell) with results plotted similarly on a beta - globin calibration curve to provide an estimate of the total number of cells tested.
its a pity, though, that Nics calibration curves arent inversed really, before constructing his «jeffreys prior».
Moreover, the radiocarbon community has suggested the use of local calibration curves to better account for regional MRE offsets in the heterogeneous ocean reservoir, but a reasonable method for their construction has not yet been proposed.
A C production record has been calculated from the Intcal04 C calibration curve (Reimer et al. 2004).
Calibrated the dozens of CO, NO, NO2, O3 and PM2.5 sensors and generated the regression calibration curve for them.
The statistical relationship then becomes, given independence of calibration curve and radiocarbon determination uncertainty:
Additional file 1: DLS results / TEM histogram / Calibration curve for sugar quantification / ICP - MS conditions / Carbonyl formation at different concentrations / Extracellular quantification of silver ions.
«We could use the calibration curve that we describe in the second paper to predict the length of time it will take the material to crystallise.»
The calibration curve «fit very nicely,» Moini says, noting that no silk artwork was harmed.
This is mapped via the calibration curve into a real age distribution on the x-axis, and Nic has provided two worked examples using a uniform prior and his favoured Jefferies prior.
So in both cases, one can construct a confidence / credible interval for the carbon - 14 age by well - known methods (that exhibit perfect probability matching), and then simply transform the endpoints of this interval to calendar years using the calibration curve (which I'll assume is known exactly, since uncertainty in it doesn't seem to really affect the argument).
I have accordingly carried out frequentist coverage testing, using 10,000 samples drawn at random uniformly from both the full extent of my calibration curve and from various sub-regions of it.
It is telling us that radiocarbon dating is blind in this region, due to the plateau in the calibration curve.
If the calibration curve were monotonic and had an unvarying error magnitude, the calibration curve error could be absorbed into a slightly increased 14C determination error, as both these uncertainty distributions are assumed Gaussian.
The calibration curve takes account of changes in 14C production rates due to varying solar and geomagnetic shielding.
The flat spot on the calibration curve represents mean failure time of the widget for a given activity age of catalyst, invariant until the catalyst starts to fail.
Subjective Bayesians will probably throw up their hands in horror at it, since it would be unphysical to think that the probability of a sample having any particular calendar age depended on the shape of the calibration curve.
In particular, calendar ages where the calibration curve is almost flat have almost zero posterior probability density, even when they are entirely compatible with the observed data.
The Jeffreys prior on C14 age should be rejected because it implies a bizarre prior on the calibrated date of interest, given the objective information in the calibration curve.