nls refers to nonlinear least-squares and is a function in R that allows to estimate the parameters of a nonlinear model.
nls should not be confused with nls-lang which is an environment variable for Oracle databases.
Questions tagged [nls]
670 questions
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NLS Function By Group
I have a dataset where I want to apply non linear least squares by group. This is a continuation to my previous question:
NLS Function - Number of Iterations Exceeds max
The dataset looks like this:
df
x y GRP
0 0 1
426 9.28…
nak5120
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1 answer
NLS Function - Number of Iterations Exceeds max
I have a dataset that looks like this:
dput(testing1)
structure(list(x = c(0, 426.263081392053, 852.526162784105,
1278.78924417616,
1705.05232556821, 2131.31540696026, 2557.57848835232, 2983.84156974437,
3410.10465113642, 3836.36773252847,…
nak5120
- 4,089
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How to calculate confidence interval of adstock rate calculated using nls function in R?
I have calculated adstock rate for TV GRP using nls function of R. I have used below code to calculate it:
# Adstock function
adstock <- function(inp_x, rate=0){
return(as.numeric(stats::filter(x= inp_x, filter=rate,…
Ankita Patnaik
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Skipping errors in data table computation using nls
This question builds off a previous one I asked here Exponential curve fitting with nls using data.table groups.
I am fitting exponential curves using nls to a data table object by multiple groups. Not all of the data appears to fit an exponential…
Justin
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1 answer
Exponential curve fitting with nls using data.table groups
I'd like to fit exponential curves to groups 1 & 2 in the data table shown below and obtain a new column containing the residual standard error corresponding to each group. The exponential curve should follow y=a*exp(b*x)+c
## Example data table
DT…
Justin
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1 answer
nlsTracePlot returns "is not a function" - how to solve this issue?(R)
I have a dataframe, with
### create sample data
set.seed(1)
x = runif(n = 100, 0, 20)
beta1 = 2
beta2 = 1
beta3 = (1/2)
### Create sample data frame and vector
y = beta1 + beta2*x^(beta3) + rnorm(n = 100, 0, 0.01)
data =…
Serkan
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How to close the gap between summarized predicted data and monthly truth data.
This question is somewhat of a follow up question to an earlier one I had here:
R: Summarize inside an nlsLM() statement
With the answer supplied, I am able to make appropriate minutely predictions when only given monthly data. However, this being…
obewanjacobi
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1 answer
How can i fit a power curve from a non-linear regression?
I am trying to fit a curve following a non-linear regression.
Here is my dataset:
stem_diameter <- c(15, 15, 16, 17, 19, 23, 23, 24, 24, 25, 25, 26, 27, 28, 29, 30, 30, 32, 32, 33, 34, 34, 35, 36, 36, 37, 38, 40, 41, 41, 42, 42, 46, 48, 48, 49, 51,…
G Jones
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R : Robust nonlinear least squares fitting of three-phase linear model with confidence & prediction intervals
I would like to fit a monotonically increasing three-phase linear model using nls in R.
Say I have data
y <- c(4.5,4.3,2.57,4.40,4.52,1.39,4.15,3.55,2.49,4.27,4.42,4.10,2.21,2.90,1.42,1.50,1.45,1.7,4.6,3.8,1.9)
x <-…
Tom Wenseleers
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Extrapolation in R
I have a reference data set, p,
p=structure(list(v = 0:26, t = c(Inf, 1.016, 0.568, 0.418666666666667,
0.344, 0.2992, 0.269333333333333, 0.248, 0.232, 0.219555555555556,
0.2096, 0.201454545454545, 0.194666666666667, 0.188923076923077,
0.184,…
Haribo
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Oracle Matrix for AL32UTF8 characterset
Using the DUMP command within Oracle, it produces the following :
SQL> select dump(field1, 1016) from test_nls;
Typ=1 Len=8 CharacterSet=AL32UTF8: c3,bd,c3,a3,c3,a1,c3,b6
Is there a AL32UTF8 matrix of sort out there where I can compare the two…
Unhandled Exception
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4 answers
Oracle - Change start day of Week - Tuesday
I want to change the start day of week in Oracle, and I need to calculate some reports for each week from daily/hourly data.
Through lot of Google search I got only NLS_TERROTORY option, from which I don't know how to set to TUESDAY. Even if there…
Ram
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2 answers
Oracle 10g NLS Parameters
Could people please let me know if there are any issues with setting Oracle 10g NLS Parameters at database level, specifically the NLS_TERRITORY to the country I am in together with setting the timezone to UTC.
Will there be any conflicts b/c as the…
tonyf
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How can I use nsl(function) in R to find parameters of a model?
I've got the following:
x <- c(549.9 , 400 , 325.9 , 250.2 , 200.1 , 150 , 120 , 79.92 , 39.96)
y <- c(5.748 , 3.50152 , 2.70204 , 2.54265 , 2.52241 , 1.35861 , 1.377444444 , 1.279055556 , 1.05501)
nls(y ~ A + B*(x^C))
I haven't managed to make…
Gilmar Neves
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2 answers
Using nls and ggplot2 to fit a logarithmic curve to data
I am using R to fit data on a logarithmic curve with equation:
y = a * log(b * x)
My data looks like this:
#Creating example data
pre <- c(946116, 1243227, 1259646, 1434124, 1575268, 2192526, 3252832, 6076519)
post <- c(907355, 1553586, 1684253,…
hemicellulose