Displaying 6 results from an estimated 6 matches for "nlrwr".
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lrwx
2009 May 19
4
nlrwr package. Error when fitting the optimal Box-Cox transformation with two variables
...e
below) for the demand of money data in Green (3th
Edition) but in the last step R gives the next
error message.
Error en
`[.data.frame`(eval(object$data), ,
as.character(formula(object)[[2]])[2]) :
undefined columns selected.
?Any idea to solve the problem?
Thanks in advance,
library(nlrwr)
r<-c(4.50,4.19,5.16,5.87,5.95,4.88,4.50,6.44,7.83,6.25,5.50,5.46,7.46,10.28,11.77,13.42,11.02,8.50,8.80,7.69)
M<-c(480.00,524.30,566.30,589.50,628.20,712.80,805.20,861.00,908.40,1023.10,1163.60,1286.60,1388.90,1497.90,1631.40,1794.40,1954.90,2188.80,2371.70,2563.60)
Y<-c(2208.30,2271.40,2...
2012 Aug 14
3
self-starter functions for y = a + b * c^x
Hi
there are some predefined self-start functions, like SSmicmen, SSbiexp,
SSasymp, SSasympOff, SSasympOrig, SSgompertz, SSflp, SSlogis, SSweibull,
Quadratic, Qubic, SSexp (nlrwr)
Btw, do you know graphic examples for this functions?
The SSexpDecay (exponential decay) for y = (y0 - plateau)*exp(-k*x) +
plateau from
http://stats.stackexchange.com/questions/17126/how-can-i-make-my-r-nls-model-more-stable
works fine, too.
But now I search a self-starter for y = a + b * c^x...
2011 Feb 15
1
Passing Arguments in a function
...0.03
17 17 338.9232 40470 31740 0.04
18 18 328.8666 41880 31880 0.04
19 19 318.3219 45510 33530 0.04
20 20 308.1200 47230 33680 0.04
If i use:
library(nlrwr)
# Build a model.
decay.model <- nls(lift ~ SSexp(total.reach, y0, b), data = decay.data)
# plot the model
plot(decay.data[["total.reach"]], decay.data[["lift"]])
xv <- seq(min(decay.data[["lift"]]), max(decay.data[["total.reach"]]), 0.02)
yv <- pre...
2012 Aug 14
0
error using boxcox.nls during non linear estimation
Hi all
I?ve got a problem using boxcox.nls function in nlrwr packagge. I?m fitting several non
linear models to these data:
> x
[1] 2 1 1 5 4 6 13 11 13 101 101 101
> y
[1] 1.281055090 1.563609934 0.001570796 2.291579783 0.841891853
[6] 6.553951324 14.243274230 14.519899320 15.066473610 21.728809880
[11] 18.553054450 23.72263...
2008 Dec 24
3
statistical significance, nonlinear regression
I am using nonlinear regression to fit a couple of variables to a set of
measurements. I would like to do some significance tests for the estimated
parameters. I am able to check the confidence intervals using the Jacobian
coming out of nonlinear regression.
I do see in a paper which shows t-value (it says estimated by White
method??), f-value, f-test, and j-test, are these available in matlab,
2011 Aug 10
5
anova medidas repetidas con lme
Hola compañeros de la lista.
Tengo el siguiente set de datos:
Repeticiones <- c(rep("RI", 14), rep("RII", 14), rep("RIII", 14))
Tiempo <- rep(c(0, 2, 4, 6, 8, 10, 12, 24, 36, 48, 60, 72, 96, 120), 3)
Concentracion_celular <- c(0.4862, 0.5375, 0.4309, 0.4390, 0.4603,
0.4733, 0.3936, 0.9085, 0.5838, 0.5477, 0.6331, 0.8693, 1.0092, 0.6341,
0.5350,