[R-sig-eco] urgent help required regarding GLS - forgot to send the output in my previous email
Caroline Dreßler
caro.dressler at googlemail.com
Sat Apr 11 03:32:56 CEST 2015
*Dear R-Sig-Ecology,*
*I did a GLS analysis for my experiement which investigates the
abundance of bacteria influenced by the presence of contaminants and
different poresizes (of the microcomsm to enter for bacteria) over a
certain timeperiod (T1, T2, T3). The microcosms were filled with sand
which was spiked with contaminats. As a control no contamiants were
added to the sand: (contamination: contamin = contaminated sand,
noncontamin = noncontaminated sand. Futhermore, there were different
poresizes for the microorganisms to enter: (poresize: pore a = 2µm,
pore b = 30µm). The samples were analysed after three timepoints:
(timepoint: T1, T2, T3 = timepoint) *
*I got an significant result for the three-way-interaction
timepoint:poresize:contamination. Now I would like to show my results
in a graph with a linear regression for the different interactions.
But I don`t know how to calculate the intercepts as well as the slopes
for the following interactions: **timepoint:pore a:contamin**,
**timepoint:pore a:noncontamin, **timepoint:pore b:contamin,
**timepoint:pore b:noncontamin.*
*In my opinion the slope can`t be negative. *
*The output was:*
Coefficients:
Value Std.Error t-value p-value
(Intercept)
-2477166 1103724 -2.244371 0.0329
timepoint
2477158 1103599 2.244617 0.0329
poreb
-49849874 6934889 -7.188273 0.0000
contaminnon
2407662 1109466 2.170108 0.0386
timepoint:poreb
49854182 6934107 7.189705 0.0000
timepoint:contaminnon
-2407655 1109341 -2.170346 0.0386
poreb:contaminnon
48366511 6970970 6.938275 0.0000
timepoint:poreb:contaminnon -48357964 6970184 -6.937832 0.0000
Correlation:
(Intr) timpnt poreb cntmnntmpnt:p tmpnt:c prb:cn
timepoint
-1.000
poreb
-0.159 0.159
contaminnon
-0.995 0.995 0.158
timepoint:poreb
0.159 -0.159 -1.000 -0.158
timepoint:contaminnon
0.995 -0.995 -0.158 -1.000 0.158
poreb:contaminnon
0.158 -0.158 -0.995 -0.159 0.995 0.159
timepoint:poreb:contaminnon
-0.158 0.158 0.995 0.159 -0.995 -0.159 -1.000
*I am in urgent need of help. Somebody please give me a valuable suggestion
for my problem. Thanks a lot,*
Caro
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