Displaying 6 results from an estimated 6 matches for "b41".
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2005 Apr 17
1
nls segmented model with unknown joint points
...nls and perhaps eventually in nlme. I can fit this model in sas (see
below, joint points to be estimated are a41 and a41), but am unsure how
to specify this in the nlm function. I would really appreciate any
suggestions or example code. Thanks a lot. -andy
proc nlin data=Stems.Trees;
params b41=-3 b42=1.5 b43=-1.5 b44=50 a41=0.75 a42=0.1;
term1 = (b41*(x - 1) + b42*(x**2 -1));
if (a41 - x) >= 0 then
term2 = (b43*(a41 - x)**2);
else
term2 = 0;
if (a42 - x) >=0 then
term3 = (b44*(a42 - x)**2);
else
term3 = 0;
model y = term1+term2+term3;
run;
2010 Mar 24
4
grouping and acts_as_tree
hi,
im using acts_as_tree and im not sure on how to group find-result.
x = find.almost_all
<p>
<% for y in @x.ancestors.reverse %>
<%= link_to h(y.title), page %> >
<% end %>
</p>
gives me a nice "breadcrum". but how is it possible to group the list lets
say by the 1level or second level?
thx
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2010 Feb 04
1
Bug in as.character? (PR#14206)
...ard
************
Browse[2]> formula.str
y ~ -1 + b1 + b2 + b3 + b4 + b5 + b6 + b7 + b8 + b9 + b10 + b11 +
b12 + b13 + b14 + b15 + b16 + b17 + b18 + b19 + b20 + b21 +
b22 + b23 + b24 + b25 + b26 + b27 + b28 + b29 + b30 + b31 +
b32 + b33 + b34 + b35 + b36 + b37 + b38 + b39 + b40 + b41 +
b42 + b43 + b44 + b45 + b46 + b47 + b48 + b49 + elevation +
f(idx, model = "sphere", sphere.dir = "global_temperature_80s",
T.order = 2, K.order = 2, T.model = "rotsym", K.model =
"rotsym",
initial = c(-4, 1, 0), param = c(-4, 0....
2008 Sep 09
1
creating table of averages
..."a21"
[7] "a22" "a23" "a31" "a32"
"b11" "b12"
[13] "b13" "b21" "b31" "b32"
"b33" "b41"
[19] "b42" "c11" "c12" "c21"
"c22" "c23"
[25] "c31" "c32" "c33" "d11"
"d12" "d13"...
2001 Sep 11
2
Differential Equations Using R?
To whom it may concern,
I am a student at Macaleste College, and next semester Macalester
is going to offer a course for CellBio that is mainly statistically based.
For the most part the students will be using R for analysis. The problem is
there will be some simple differential equations for the students to solve.
The committee that in charge of the classes corriculam would like only to
2013 Apr 22
7
Multiple lon lat points in the map with ggplot2
Hello R users,
For the last few days I am struggling with the following task:
my data.frame:
A1 A2 A3 B1 B2
B3
58.81 53.292 54.501 13.013 17.39 19.407 56.02 56.251 54.033 20.099 13.15
10.411 55.376 53.099 57.625 13.396 21.031 13.22 58.584 53.194 54.218
13.038 16.854 19.289 55.7 55.921 53.847 19.942 13.153 9.828 55.093 52.934