Displaying 20 results from an estimated 700 matches similar to: "Contextstack overlow"
2008 Jun 12
2
Predicting from an nls model
I keep running up against the same error when I try to plot a line from a nls model. The data is fisheries length/weight data. Code follows:
require(graphics)
pow = nls(Weight~alpha*Length^beta, data=wae,
start=list(alpha=0.0000001, beta=3.0), trace=TRUE)
predict(pow)
plot(Weight~Length,
2008 Dec 22
3
Summary information by groups programming assitance
All -
I have data that looks like
psd Species Lake Length Weight St.weight Wr
Wr.1 vol
432 substock SMB Clear 150 41.00 0.01 95.12438
95.10118 0.0105
433 substock SMB Clear 152 39.00 0.01 86.72916
86.70692 0.0105
434 substock SMB Clear 152 40.00 3.11 88.95298
82.03689 3.2655
435 substock SMB Clear
2010 Aug 23
2
Quantile Regression and Goodness of Fit
All -
Does anyone know if there is a method to calculate a goodness-of-fit
statistic for quantile regressions with package quantreg?
Specifically, I'm wondering if anyone has implemented the
goodness-of-fit process developed by Koenker and Machado (1999) for R?
Though I have used package quantreg in the past, I may have overlooked
this function, if it is included.
Citation:
Koenker, R. and
2008 Jun 13
2
Quartile regression question
I have data that looks like
lake,loglength,logweight
1,2.369215857,1.929418926
1,2.426511261,2.230448921
1,2.434568904,2.298853076
1,2.437750563,2.298853076
1,2.442479769,2.230448921
1,2.445604203,2.356025857
...
102,2.722633923,3.310268367
102,2.781755375,3.502153893
102,2.836324116,3.683407299
102,2.802773725,3.583312152
102,2.790285164,3.546419267
102,2.806179974,3.599118565
2008 Jun 10
3
newbie nls question
I'm tyring to fit a relatively simple nls model to some data, but keep coming up against the same error (code follows):
Oto=nls(Otolith ~ Linf*(1-exp(-k(AGE-to))),
data = ages,
start = list(Linf=1000, k=0.1, to=0.1),
trace = TRUE)
The error message I keep getting is "Error in eval(expr, envir, enclos) : could not find function "k"". I've used this
2008 Aug 22
2
Newbie programming help
All -
Not sure if this is a real programming question, but here goes:
I have data that looks like
Lake Length Weight
1 158 45
1 179 70
1 200 125
1 202 150
1 206 145
1 209 165
1 210 140
1 215 175
1 216 152
1 220 150
1 221 165
...
where lake goes from 1 - 84 and the number of rows for each lake is variable (but > ~20).
I'm trying to do two things: 1) build a simple linear model of the
2008 Dec 29
0
Serial Correlation Test for Short Time Series
Hello,
Are there any R functions available for performing a serial correlation test
for short
time series (e.g, series having between 10-14 observations)?
Many thanks!
Isabella R. Ghement, Ph.D.
Ghement Statistical Consulting Company
301-7031 Blundell Road, Richmond, B.C., Canada, V6Y 1J5
Tel: 604-767-1250
Fax: 604-270-3922
E-mail: isabella at ghement.ca
Web: www.ghement.ca
-----Original
2008 Sep 02
2
nls.control()
All -
I have data:
TL age
388 4
418 4
438 4
428 5
539 10
432 4
444 7
421 4
438 4
419 4
463 6
423 4
...
[truncated]
and I'm trying to fit a simple Von Bertalanffy growth curve with program:
#Creates a Von Bertalanffy growth model
VonB=nls(TL~Linf*(1-exp(-k*(age-t0))), data=box5.4,
start=list(Linf=1000, k=0.1, t0=0.1), trace=TRUE)
#Scatterplot of the data
plot(TL~age, data=box5.4,
2008 Jul 03
1
lm() question
I have data that looks like
YC Age Num
82 11 2
83 10 0
84 9 8
85 8 21
86 7 49
87 6 18
88 5 79
89 4 28
90 3 273
91 2 175
with a program
mod1=lm(log(Num+1)~YC, data=box44)
plot(log(Num+1)~YC, data=box44, pch=19, xlab="Year Class",
ylab="Loge Number at age", ylim=c(0,6), xlim=c(91,82))
abline(lm(log(Num+1)~YC), col="blue", lwd=2)
summary(mod1)
I need to
2008 Aug 29
1
lm() and dffits
All -
My question is a bit involved, so bear with me.
I have some data that looks like:
Lake LL LW
81 2.176091259 1.342422681
81 2.176091259 1.414973348
81 2.176091259 1.447158031
81 2.181843588 1.414973348
81 2.181843588 1.447158031
81 2.184691431 1.462397998
81 2.187520721 1.447158031
81 2.187520721 1.477121255
81 2.187520721 1.505149978
...
[truncated]
I'm trying to:
1) fit a simple
2008 Jul 03
1
lines() warning message
I have data that looks like
Year,Recruit,Spawner,Mtempcv
1958,4532,775,0.24125
1959,22996,2310,0.16319
1960,628,2990,0.46056
1961,879,1400,0.33028
1962,14747,1130,0.22618
1963,13205,790,0.20596
1964,31793,1195,0.19229
1965,10621,981,0.20363
1966,22271,870,0.3452
1967,8736,1104,0.27511
1968,8761,883,0.10884
1969,18885,1421,0.17799
1970,10098,1198,0.2106
1971,3394,760,0.22098
1972,1697,1354,0.39461
2008 Mar 17
3
contextstack overflow
Hi all,
I´m an absolute beginner in R programming…I have a really long R-code with
many variables. When I run the program I always get an error at the same
place called “contextstack overflow”. Does anybody know what to do in this
case? Are there so strict limitations in R? If yes, is it possible to handle
it? How?
Thank you for any help!
[[alternative HTML version deleted]]
2010 Nov 19
1
TukeyHSD error
All -
I think I'm being dense, but for the life of me, I can't figure out
why I get error message with the code below.
I have data that looks like
param level perc.surv asin.tran
DO 3 0.6864407 0.9764544
DO 3 0.1250000 0.3613671
DO 3 0.8738739 1.2077299
DO 4 0.4615385 0.7468986
DO 4 0.5691057 0.8547258
DO 4 0.8504673 1.1737517
DO 6 0.5494505 0.8349297
DO
2007 Feb 20
1
contextstack overflow
Hello!
I written several implementations in R of R?my's algorithm for
generating random ordered strictly binary trees on 2n+1 vertices.
One implementation involves manufacturing character strings like:
"X <- list(0,list(0,0))"
for the case n=2. If I perform the following two steps:
cmd <- "X <- list(0,list(0,0))"
eval(parse(text=cmd))
then X becomes a true
2008 Aug 01
1
Confidence intervals with nls()
I have data that looks like
O.lengthO.age
176 1
179 1
182 1
...
493 5
494 5
514 5
606 5
462 6
491 6
537 6
553 6
432 7
522 7
625 8
661 8
687 10
704 10
615 12
(truncated)
with a simple VonB growth model from within nls():
plot(O.length~O.age, data=OS)
Oto = nls(O.length~Linf*(1-exp(-k*(O.age-t0))), data=OS,
start=list(Linf=1000, k=0.1, t0=0.1), trace=TRUE)
mod <- seq(0, 12)
2004 Sep 10
3
call quality monitoring
I need to debug a call quality issue with remote users on the other
end of a satellite link. The symptoms are: we here on the Internet
side can hear them just fine. On their end, things work sorta OK most
times, but they often suffer from severe dropouts and digital
warbling, both of which I attribute to them missing packets. Often
times they can't make out a word we are saying while we can
2012 Nov 27
4
Finding values in one column and
All -
I have a data frame
data.a
ID valueA valueB
6 12 12
17 15 14
58 18 16
98 11 12
73 19 20
84 19 14
58 20 14
24 11 12
81 15 16
21 15 14
62 14 12
67 13 14
78 13 17
35 10 13
13 11 15
14 17 18
85 16 15
35 13 9
18 15 16
and a data frame
data.b
ID valueA valueB
6
84
21
78
14
I'd like to have R find the data.b$ID in data.a$ID and insert the
corresponding data.a$valueA and
2012 Dec 11
5
Retain last grouping after a strsplit()
All -
I have a column of SiteNames:
SiteName
OYS-PIA2-FL-1
OYS-PIA2-LA-1
OYS-PI-LA-BB-1
OYS-PIA2-LA-10
...
[truncated]
and I want to include only the last few digits into a new column.
I tried
substr(data$SiteName, 13, 20)
but because some SiteName values are of a different length, the final
hyphen (i.e., "-") was included:
"1"
"1"
"-1"
"10"
2011 Mar 24
3
tapply with specific quantile value
All -
I have an example data frame
x l.c.1
43.38812035 085
47.55710661 085
47.55710661 085
51.99211429 085
51.99211429 095
54.78449958 095
54.78449958 095
56.70201864 095
56.70201864 105
59.66361903 105
61.69573564 105
61.69573564 105
63.77469479 115
64.83191994 115
64.83191994 115
66.98222118 115
66.98222118 125
66.98222118 125
66.98222118 125
66.98222118 125
and I'd like to get the 3rd
2012 Oct 15
1
rJava install - "%1 is not a valid Win32 application."
All –
I’m having a problem with the rJava package. I can download it to my
machine (Win 7 64-bit) but when I try to load the package into R (2.15.1,
64-bit version), I get the following error:
> require(rJava)
Loading required package: rJava
Error : .onLoad failed in loadNamespace() for 'rJava', details:
call: inDL(x, as.logical(local), as.logical(now), ...)
error: unable