Displaying 4 results from an estimated 4 matches for "vhat".
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2009 Sep 24
1
Maximum likelihood estimation of parameters make no biological sense
R-help,
I'm trying to estimate some parameters using the Maximum Likehood method.
The model describes fish growth using a sigmoidal-type of curve:
fn_w <- function(params) {
Winf <- params[1]
k <- params[2]
t0 <- params[3]
b <- params[4]
sigma <- params[5]
what <- Winf * (1-exp(- k *(tt - t0)))^b
2011 Sep 19
1
"could not find function" after import
...ng to build a package (GWASTools, submitted to Bioconductor)
that uses the "sandwich" package. I have references to "sandwich" in
DESCRIPTION:
Imports: methods, DBI, RSQLite, sandwich, survival, DNAcopy
and NAMESPACE:
import(sandwich)
In the code itself is a call to vcovHC:
Vhat <- vcovHC(mod, type="HC0")
I have sandwich version 2.2-7 installed.
When I run R CMD check on my package, I get the following error during
checking of examples:
* using R Under development (unstable) (2011-08-29 r56828)
* using platform: x86_64-apple-darwin9.8.0 (64-bit)
...
* check...
2006 Jul 08
1
KhmaladzeTest
...tion")
$taus
[1] 0.3161186 0.3543310 0.4007676 0.4150787 0.4268406 0.4542215
0.5008570 0.5304535 0.5690997
[10] 0.6206522 0.6522563
$qtaus
[1] -0.037757189 -0.033227447 -0.032656681 -0.016152701 -0.015090004
-0.014413058
[7] -0.013738239 -0.013471008 -0.012253429 -0.010675005 -0.009866834
$Vhat
[,1] [,2] [,3] [,4] [,5] [,6]
[,7] [,8]
[1,] 0.3064789 0.5104205 0.6209815 -0.0850221 -0.2053440 -0.1631580
-0.1766553 -0.1768334
[,9] [,10] [,11]
[1,] -0.1483747 -0.1191922 -0.1026903
$vhat
[,1] [,2] [,3]...
2005 Sep 13
11
if() command
Hi everyone !
Could you please help me with this problem ?
I??ve trying to write a code that assign to a variable the content from
another, but all I??ve got is a message error. For example:
if (age <=10) {group == 1}
else if (age > 10 & age <= 20) {group == 2}
else {group == 3}
Syntax error
Or
if (age <=10) {group == 1}
else (age > 10 & age <= 20) {group == 2}