ArArCALC Help Library -- Display Additional Statistics

2.3.14 Display Additional Statistics

Choosing the Options # Additional Statistics menu item displays a dialogbox containing a summary of the plateau age (or J-value), plus a list of additional statistical parameters describing the shape and form of the plateau itself. The perfect (flat) age plateau would have a slope and skewness of zero, a high positive kurtosis and a low square of deviations.

Note The Plateau Slope is expressed here as the age difference over the age plateau for each 10% of the total amount of ³⁹Ar(k) released in your experiment. In the example above the age plateau has a width of 60%and includes 14 incremental heating steps (data not shown in this dialogbox). The measured ages thus decreased by 6 x -0.316 Ma = -1.896 Ma over the course of this particular age plateau. Although this may indicate some minor ³⁹Ar recoil acting on the age plateau, the disturbance falls within the 95% confidence envelop of this age plateau, as shown by a MSWD of 2.0 that is still lower than the t-student test value of 2.16 (not shown here).


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Contents	ArArCALC
Chapter 2	Function by Function
Topic 2.3.1	Close
Topic 2.3.2	Save Calculations
Topic 2.3.3	Export for Publication
Topic 2.3.5	Switch to Data Reduction
Topic 2.3.6	Edit Menu
Topic 2.3.7	Tables Menu
Topic 2.3.8	Normal and Inverse Isochron Menus
Topic 2.3.9	Heating Unit
Topic 2.3.10	Import Additional Experiment
Topic 2.3.11	Calculate as Flux Monitor
Topic 2.3.12	Calculate as Lunar Sample
Topic 2.3.20	Attach Latest Master Log File
Topic 2.3.22	Ka, Ma and Ga Buttons
Topic 2.3.23	Table Sorting
Topic 2.3.24	Table Zooming
Topic 2.3.25	Delete Analyses
Topic 2.3.26	Degassing Patterns Toolbox
Topic 2.3.27	Copy Chart
Topic 2.3.28	Save Chart
Topic 2.3.29	Reset
Topic 2.3.30	Recalculate