Displaying 7 results from an estimated 7 matches for "d13c".
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2012 Sep 03
1
Scatter plot from tapply output, labels of data
Hei,
i am trying to plot the means of two variables (d13C and d15N), by 2
grouping factors (Species and Year) that i obtained by the function tapply.
I would like to plot with different colours according to the Year and show
the "Species" as data labels.
My data looks like this:
Species d13C d13N Year
"Species1" 14,4...
2017 Nov 27
0
How to extract coefficients from sequential (type 1) ANOVAs using lmer and lme
...ients are wrong. Specifically, it looks like that the coefficients arefrom ANOVA with ?marginal? (type III sums of squares). I have tried both lme (nlmepackage) and lmer (lme4 + lmerTEST packages). Examples of the results arebelow:
?
?
> #mixed-effect modelusing lme
>model.short.psme.bulk.d13c.3 <- lme(isotopebulk_add_log ~narea+sampleheight, random= ~1|tree,
+??????????????????????????? data =ht_data_short_psme, na.action = na.exclude)
>
?
>anova(model.short.psme.bulk.d13c.3, type ="sequential")
???????????? numDF denDF?? F-value p-value
(Intercept)????? 1????...
2013 Oct 31
0
SIAR problem with model running
...I have prepared my data according to Inger, R., Jackson, A., Parnell, A.,
Bearhop, S. : SIAR V4 (Stable Isotope Analysis in R) an Ecologist's Guide
(also better known as 'SIAR for dummies'), which is as follows:
- consumer data table (columns include code for species, d15N signatures,
d13C signatures)
- source data table (columns include Source, mean d15N, SD d15N, Mean
d13C, SD d 13C)
- trophic enrichment factor table (columns include source, mean15N, SD
d15N, mean d13C, SD d13C)
I've read the tables in as .txt ('data' for consumer data, 'sources' for
source d...
2011 Nov 10
4
Error in Summary.factor(c(1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 4L, : max not meaningful for factors
...ecause of the error code below. Is this because of
the first column being names? How do I rename the columns and to what?
Below is the code and data frames with some omissions of values. In the
middle is the model I am trying to run, which returns with the error code
above.
> data
pond d13C d15N
1 A3 -2.07 6.06
2 F4 -2.39 1.3
3 K3 -2.11 1.70
> tef
tefsources tefMeand13C tefSDd13C tefMeand15N tefSDd15N
1 Copepoda 0.4 1.3 3.4 0.99
2 Algal Paste 0.4 1.3 3.4 0.99
3 Amphipoda...
2011 Nov 10
3
Error in matrix, not ordered vectors or numerical value, and SIAR.
Help!
model1 <- siarmcmcdirichletv4(data, source, tef, concdep=0, 500000, 50000)
Error in matrix(1, ncol = (numsources + numiso) * numgroups, nrow =
(siardata$iterations - :
invalid 'ncol' value (too large or NA)
In addition: Warning message:
In Ops.ordered((numsources + numiso), numgroups) :
'*' is not meaningful for ordered factors
Previous message, but more problems:
2012 Nov 14
0
SIAR: problem> session aborted
...location now, since 'help' told me a
single group is more easy):
> d15N<-c(13.3175, 13.8675, 12.8775, 15.0785, 15.351, 14.6755,
> 14.94002083, 14.2072, 13.4987, 13.6522, 14.8447, 13.4257, 13.5632,
> 15.4282, 11.4187, 14.4442, 13.5187, 12.7762, 14.8627, 13.1272)
> d13C<-c(-23.4585, -23.078, -22.386, -17.8665, -16.1325, -20.914,
> -20.2144375, -15.52133333, -18.86783333, -18.54733333, -19.02683333,
> -15.12533333, -19.65833333, -17.56533333, -19.11833333, -19.17783333,
> -24.32233333, -24.03133333, -16.01333333, -23.81783333)
> location<-c(3...
2006 Jun 26
1
NLS and fitting of x-values?
...ggs laid by Springtails everyday over 28 days after swich to isotopically enriched diet. The eggs were pooled at day 7, 14, and 28 (+ day 0 = initial value) and analyzed for isotopes. After the diet switch the isotopic values of the adults and eggs change towards those of the new diet.
Here are the d13C values (y) of the eggs:
x y
0 -22.2
0 -22.2
0 -22.2
0 -22.0
7 486.9
7 498.6
7 489.6
14 820.9
14 817.4
28 895.6
28 900.7
28 890.6
28 885.8
The y values represent the mean of the sampling period.
The dataset is very small but previous experiments have shown that a exponen...