Description Usage Arguments Format Value Examples
This selfStart model evaluates the exponential growth
regression model and its gradient. It has an initial
attribute that will evaluate initial estimates of the parameters
y0
, and b
for a given set of data. Instead of the standard
exp
function this implementation use the 10^
function.
f(x)=y_0 \times 10^b
1 | SSexpcons(..constraint.value, x, b)
|
..constraint.value |
a numeric value representing the value of the
response when |
x |
a numeric vector of values at which to evaluate the model |
b |
a numeric parameter representing the growth rate |
A selfStart model
The value returned is a list containing the nonlinear function, the self starter function and the parameter names.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | # Load data
data(ecdata)
data(mfidata)
# Select analyte FGF for plate 1
dat <- mfidata[mfidata$plate=="plate_1" & mfidata$analyte=="FGF",]
sdf <- data_selection(dat, ecdata)$plate_1
cons <- scluminex("plate_1",sdf$standard, sdf$background,
lfct="SSexp",
bkg="constraint",
fmfi="mfi",
verbose=FALSE)
summary(cons)
# Comparison constraint vs no constraint (same returning value but estimate
# one parameter).
b <- 3
y0 <- 1
concentration <- 2
SSexp(concentration, b, y0)
SSexpcons(y0, concentration, b)
|
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.