sortedXyData {stats}  R Documentation 
sortedXyData
ObjectThis is a constructor function for the class of sortedXyData
objects. These objects are mostly used in the initial
function for a selfstarting nonlinear regression model, which will be
of the selfStart
class.
sortedXyData(x, y, data)
x 
a numeric vector or an expression that will evaluate in

y 
a numeric vector or an expression that will evaluate in

data 
an optional data frame in which to evaluate expressions
for 
A sortedXyData
object. This is a data frame with exactly
two numeric columns, named x
and y
. The rows are
sorted so the x
column is in increasing order. Duplicate
x
values are eliminated by averaging the corresponding y
values.
JosÃ© Pinheiro and Douglas Bates
selfStart
, NLSstClosestX
,
NLSstLfAsymptote
, NLSstRtAsymptote
DNase.2 < DNase[ DNase$Run == "2", ]
sortedXyData( expression(log(conc)), expression(density), DNase.2 )