determineStartRect: Calculate starting values for an ARF model
In arf3DS4: Activated Region Fitting, fMRI data analysis (3D).

Description Usage Arguments Details Value Author(s) See Also

determineStartRect calculates starting values for an ARF model by searching for maxima and minima in the data, and estimating the width of these maxima/minima.

1 2	determineStartRect(arfmodel, options = loadOptions(arfmodel)) determineStartRectSimple(arfmodel, options = loadOptions(arfmodel))

`arfmodel`	An ARF model object (class `model`)
`options`	An "options" object (class `options`), by default the options.Rda from the current model is loaded. The value of `options@start.maxfac` determines the calculation of the spatial extent values, higher settings will lead to greater extent values.

determineStartRect determines the maxima and minima of the data and at each maximum/minimum searches in each dimension (x,y,z) the point where the maximum/minimum value is half its original value. This creates a box around the maximum/minimum, which is set to zero, to avoid searching the same area twice. The widths of this box are taken as starting values for the width-parameters.

Returns the ARF "model" object, with the starting values in the @startval slot.

Wouter D. Weeda - w.d.weeda@gmail.com

model, options

arf3DS4 documentation built on May 2, 2019, 8:19 a.m.