SiZer,SiCon {feature} | R Documentation |
SiZer and SiCon plots for 1-dimensional data
Description
SiZer (Significant Zero crossings) and SiCon (Significant Convexity) plots for 1-dimensional data.
Usage
SiZer(x, bw, gridsize, scaleData=FALSE, signifLevel=0.05, plotSiZer=TRUE,
logbw=TRUE, xlim, xlab, addLegend=TRUE, posLegend="bottomright")
SiCon(x, bw, gridsize, scaleData=FALSE, signifLevel=0.05, plotSiCon=TRUE,
logbw=TRUE, xlim, xlab, addLegend=TRUE, posLegend="bottomright")
Arguments
x |
data vector |
bw |
vector of range of bandwidths |
gridsize |
number of x- and y-axis grid points |
scaleData |
flag for scaling the data i.e. transforming to unit variance for each dimension. |
signifLevel |
significance level |
plotSiZer , plotSiCon |
flag for displaying SiZer/SiCon map |
logbw |
flag for displaying log bandwidths on y-axis |
xlim |
x-axis limits |
xlab |
x-axis label |
addLegend |
flag for legend display |
posLegend |
legend position |
Details
The gradient SiZer and curvature SiCon maps of Chaudhuri & Marron (1999) are implemented. The horizontal axis is the data axis, the vertical axis are the bandwidths. The colour scheme for the SiZer map is red: negative gradient, blue: positive gradient, purple: zero gradient and grey: sparse regions. For the SiCon map, orange: negative curvature (concave), blue: positive curvature (convex), green: zero curvature and grey: sparse regions.
Value
SiZer/SiCon plot sent to graphics window.
References
Chaudhuri, P. & Marron, J.S. (1999) SiZer for exploration of structures in curves. Journal of the American Statistical Association, 94, 807-823.
See Also
Examples
data(earthquake)
eq3 <- -log10(-earthquake[,3])
SiZer(eq3)
SiCon(eq3)