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<div class="moz-forward-container">Dear Daniel,<br>
<br>
The SIENA Manual actually provides instructions of who to deal
with the problem of leaving and joining actors. The relevant
sections are "4.1.2 Structurally determined values" and "4.8
Composition change: joiners and leavers". In general, you either
specify an actor as absent from the network by setting the value
of his ties as "structural zeros", you set ties of absent actors
to missing or you specify absent actors with
sienaCompositionChangeFromFile or sienaCompositionChange.<br>
<br>
If I understand you correctly you transform your adjacency matrix
into an igraph object, subset for your desired attributes, then
back into an adjacency matrix and on the way you lose some of your
actors? You could insert rows and columns by hand (insertCol and
insertRow from the micEcon package do that), but that seems rather
cumbersome. Have you tried subsetting your ties directly from the
adjacency matrix? Maybe transforming your year attribute in an
attribute matrix and then using that to subset your original
matrix?<br>
<br>
<br>
Hope that helps,<br>
Christoph Stich<br>
MSc candidate Urban Studies, University of Amsterdam<br>
<br>
<br>
<br>
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Today's Topics:<br>
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1. Transform 1-mode edgelist to adjacency matrix (Daniel
Stefan Hain)<br>
<br>
<br>
----------------------------------------------------------------------<br>
<br>
Message: 1<br>
Date: Thu, 29 Nov 2012 15:24:03 +0000<br>
From: Daniel Stefan Hain <<a moz-do-not-send="true"
href="mailto:dsh@business.aau.dk">dsh@business.aau.dk</a>><br>
To: "<a moz-do-not-send="true"
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<<a moz-do-not-send="true"
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Subject: [Rsiena-help] Transform 1-mode edgelist to adjacency
matrix<br>
Message-ID:<br>
<<a moz-do-not-send="true"
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<br>
Hi dear RSiena community,<br>
<br>
I currently have the following problem. I am conducting a
dynamic analysis on cooperation in research project on basis
of a directed edgelist that looks like follows:<br>
<br>
"Project leader" "Project partner"
"Year" "Some more attributes"<br>
Firm X Firm Y
2000<br>
Firm A Firm X
2005<br>
...<br>
<br>
I want to divide the dataset into 3-4 subsets for different
periods, lets say 2000-2002, 2003- 2005 ect. That's not the
challenge (subseting in [R]), but then my problem is the
following:<br>
<br>
1.: How can I create a directed and weighted adjacency matrix
out of this data structure for every single time period? Up
to now I managed it with transforming it to an IGraph object
and then back into an adjacency matrix. That works, but the
resulting matrix for the selected timeframe does not contain
all actors from the whole dataset, thus the resulting
adjacency matrixes as input for RSiena all have different
dimensions.<br>
<br>
I up to now worked with 2-mode edgelists, there I just could
tabulate the dataframe and multiply it with the transposed one
to get the adjacency matrix. When I used subsets for the
different time period, I could exploit the fact that R still
keeps the index of everything that drops out of the subset,
but shows up in the cross-tab and therefore in the adjacency
again.<br>
<br>
With a 1-mode edgelist it obviously does not work. Any advice
is appreciated!<br>
<br>
Vest wishes<br>
<br>
Daniel S. Hain<br>
PhD Fellow, M.Sc. Economics, Dipl.-Wirt.-Ing.<br>
_______________________________________<br>
Innovation, Knowledge and Economic Dynamics (IKE) Group<br>
Strategic Research Alliance for Energy Innovation Systems
(EIS)<br>
Department of Business and Management<br>
Aalborg University<br>
Fibigerstraede 4, Room 16a<br>
9220 Aalborg ?st, Denmark<br>
<br>
Tel.: +45 9940 2724<br>
Email: <a moz-do-not-send="true"
href="mailto:dsh@business.aau.dk">dsh@business.aau.dk</a><mailto:<a
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