HIERARCHICAL TAXONOMY IN MULTI-PARTY SYSTEM

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1 HIERARCHICAL TAXONOMY IN MULTI-PARTY SYSTEM Hokky Situngkir *) Dept. Computational Sociology Banung Fe Institute Abstract We propose the use of hierarchical taxonomy to analyze the legislative election results as a moel of multi-party system to show the robustness in political system. As an example we use the result of Inonesian legislative election 004 is analyze with certain comparative with the previous one (1999). We construct the graph theoretical analysis by fining the Eucliean istances among political parties. The istances are then treate in ultrametric spaces by using the minimum spanning tree algorithm. By having the Inonesian hierarchical taxonomy moel of political parties we show some patterns emerging the pattern agrees with the classical anthropological analysis of socio-political system in Inonesia. This fact accentuates a character of robustness in Inonesian political society as a self-organize system evolves to critical state. Some small perturbations i.e.: ifferent voting process resulting the same pattern an occasions statistically, emerges from the social structure base upon political streams: Islamic, secular, traitional, an some complements of all. Keywors: election, robustness, political streams, ultrametric space, multi-spanning tree, Kruskal s Algorithm *) Propose as part of Research Report Dept. Computational Sociology, Banung Fe Institute. To corresponence visit:

2 1. Introuction In the previous work (Situngkir, 004) we have showe how the social system evolves towar the critical self-organization by analyzing the statistical properties of the national elections in 1999 an 004. The power-law signature of the general elections will be trie to be analyze eeper by analyzing the political structures of the voters in Inonesia; why an how it occurs. There are some patterns, an the paper aims to explore some scale-invariant causes of the election results. We use metho that has been use more familiarly in econophysics, i.e.: the Eucliean istances among parties base on their votes an fin to escribe the statistical situations into the ultrametric spaces by using the minimum spanning tree algorithm. Eventually, we will fin out portfolio-like iagram evolves from 1999 to 004 elections an that there happens the political robustness in the political structure of the voters (Mantegna & Stanley, 000:105-1). Figure 1 The power-law signature of Inonesian legislative election result 1999 an Visualizing political streams in ultra-metric space We normalize the votes of each political party by the highest vote in each province from ata of the election result hel in 1999 an 004. As it has been analyze in Situngkir (004), we built the histogram with a unique histogram showing the number of political parties, N(v), that receive certain fraction of votes, v. The log-log plot of both histograms show power-law signature as figure in figure 1. The election result shows that the ata is fitte with power-law istribution, N ~ α ( v) v, = α an α = 1.41, for 1999 an 004 election respectively. After the normalization, we fin the cross-correlation among the party in each province to construct cross-correlation matrix. that shows the cross-correlation coefficient among party i with party j,

3 ViV j Vi V j ρ = (1) V V V V i i j j V i is the normalize votes of party i in each province an the angular brackets inicate the average of the votes. Here, we can have the correlation coefficient ρ = [ 1..1], where 1, completely correlate ρ = 0, uncorrelate -1, completely anti correlate () We use the cross-correlation coefficient among parties by moificating the calculation of Eucliean istance among log-price ifference (Mantegna & Stanley, 000: 105-6) to extract the information hiing in the election result by calculating the istances among parties. By constructing the algebraic vectors on closely relate parties, it was foun out that the Eucliean istances ( ) among parties can be calculate as = (1 ρ ) (3) Fulfilling the properties of Eucliean istance, it shoul be hel by properties properties = 0 i = = ji ik + kj j (4) As explaine in (Mantegna & Stanley, 000: 107, & Mantegna, 1999), in orer to construct a hierarchical moel of such complex system whose elements have Eucliean istances, we nee to form taxonomy about the topological space of n objects. We o this by implicating the Minimum Spanning Tree (MST) Algorithm to the n x n istance matrix. MST is a concept of weighte graph of n objects in which a tree having n-1 eges that minimize the sum of the ege istances. To o this, we resemble the istance matrix 3

4 by applying the well-known Kruskal s algorithm. In this case, we can efine tree as a connecte graph without cycles with some properties, i.e.: there is one an only one path joining any two of its vertices, an that every one of its eges is a brige. Thus, the MST is a weighte an connecte graph having one (possibly more) the least total weight. The MST technique aims to quantify spatial ot patterns by revealing hien nearest-neighbor correlations, an the Kruskal s algorithm we use can be state as follows: begin o while (all vertex in the graph) Fin the least ege in the graph; Mark it with any given color, e.g.: blue; Fin the least unmarke (uncolore) ege in the graph that oesn't close a colore or blue circuit; Mark this ege re; en; The blue eges form the esire minimum spanning tree; en The resulting matrix is specially known as escription of political parties in an ultrametric space by physicists (Rammal, et. al., 1986). In summary, the metric of the set of political parties V is given by the assignment of real number ult, where aitional requirement, i.e.: ult fulfils requirements of Eucliean properties (eq. 4) with ult ult ult max(, ) (5) ik kj By using the algorithm above, we can have the matrix escribing the relative closest parties with their neighborhoos for each year of election, 1999 an 004. The result will be elaborate in the next section. 3. The result an analysis We have the MST of the istances of Inonesian political parties as the result of election in 1999 an 004, an iscover how the parties clustere with certain patterns in the graph. Figure 1 shows the result of our simulation on the ata of the General Election There have been 48 political parties joine the election where the citizens 4

5 vote for epen on their appropriateness. It is believe that this is the first most emocratic election Inonesia ever ha after escaping from 3 years of ictatorship regime. The istance scale in the figure equals to the maximal istance between two successive political parties encountere when moving from a certain political party to the other over the shortest path of the MST connecting them (the number of the respective political party can be seen in the appenices). (a) (b) Figure The structure of the MST of the result of the General Election 1999 (a), an The istances among parties in ultrametric space (b) 5

6 The taxonomy presente here is associate with the subominant ultrametric of certain political parties. It is a meaningful political tool since we can see how the structure of the gains of political parties regaring their voters. From the figure, we can see how most parties are close enough while some other parties are separate apart. It is also obvious that some parties are very close to each other since there is no major ifference among them perceive by the voters. (a) (b) Figure 3 The structure of the MST of the result of the General Election 004 (a), an The istances among parties in ultrametric space (b) Figure 3 shows the MST for the statistics of legislative election 004. In 004, the political reform has urge to change the rule of political system incluing the election 6

7 system. The political system has change to be the bicameralism system while General Election is hel in orer to let citizens choose irectly the members of DPR (House of Representatives), DPRD I & II (city councils) an DPD (the Regional Representative Council). Directly is by means of choose not only from the collection of political parties but choose irectly the iniviuals to be seate in certain political institutions. It is obvious that the election 004 become a hope for a better political system in Inonesia. Interestingly, compare to the previous one, the legislative election 004 hols the similar pattern, i.e.: three big parties are very istant (figure & 3). As showe in previous sections, most of other parties are trying to gain votes from the highly networke social institutions circling relate political parties. Intuitively, base upon this we can realize how the power-law signature appears in Inonesian general election, since only several parties ominate in several political streams an groups among plenty of available political parties. 6. Concluing Remarks We have showe how methoologically we can have the hierarchical taxonomy of political parties in ultrametric space as a meaningful way to see the clustering of the parties. This can be an alternative on extracting the result of general election across the country as an important statistical property. Eventually, we show also that the political streams figure out by the hierarchical taxonomy accentuate an is irectly relate to the anthropological analysis propose many years before the election. Even further, the significant changes in the micro-stages of the election o not impact irectly with the taxonomy a signature of robustness of socio-political environment. As an epilogue, several questions are left to the reaer about the process reform an emocratization in Inonesia. How robust are the circling social organizations relating to the eman of social transformations? If the social networks an social ientities have huge influence on eciing the future of a nation, how can this concern with the political program brought by the caniates? It is for sure that we are now having a signal an symptom, that the work an struggle for emocracy is about to begin by the emocratic process an it is still a long journey to finish line. 7

8 Acknowlegement The author thanks Surya Research Inc. for financial support, Tiktik Dewi Sartika, Deni Khanafiah, an Ivan Mulianta for gathering an processing ata, Yun Hariai for eep iscussions. All faults remain the author s. References: Katz, J. N. & King G. (1997). Statistical Moel for Multiparty Electoral Data. Social Science Working Paper California Institute of Technology. Kruskal Jr., J.B. (1956). On the shortest spanning subtree of a graph an the travelling salesman problem. Proc. American Math. Soc. 7: Lyra, M. L., Costa, U. M. S., Filho, R. N.C., Anrae Jr., J. S. (00). Generalize Zipf s Law in Proportional Voting Process. arxiv:con-mat/011560v1. Mantegna, R. N. (1999). Hierarchical Structure in Financial Market. The European Physical Journal B 11: Springer-Verlag. Mantegna, R. M. & Stanley, H. E. (000). Introuction to Econophysics: Correlations an Complexity in Finance. Cambrige University Press. Rammal, R., Toulouse, G., & Virasoro, M. A. (1986). Ultrametricity for Physicists. Rev. Mo. Phys. 58: Saari, D. G. (1994). Geometry of Voting. Springer-Verlag. Situngkir, Hokky. (003). Powers of the Governmental State as Feeback Control System. Journal of Social Complexity (1)1: Banung Fe Institute Press Situngkir, Hokky. (004). The Power-law Signature in Inonesian Legislative Election. Preprint: arxiv: nlin.ao/ Situngkir, H. & Hariai, Y. (003). Dinamika Evolusioner Kontrak Sosial i Inonesia. Working Paper WPK003. Banung Fe Institute Tim Litbang KOMPAS. (1999). Partai-Partai Politik Inonesia: Ieologi, Strategi, & Program. Grameia. 8

9 APPENDIX 1 The name an the number of political party in Inonesian General Election PIB KRISNA 3 PNI 4 PADI 5 KAMI 6 PUI 7 PKU 8 MASYUMI BARU 9 PPP 10 PSII 11 PDI PERJUANGAN 1 PAY 13 PKM 14 PDKB 15 PAN 16 PRD 17 PSII PKD 19 PILAR 0 PARI 1 MASYUMI PBB 3 PSP 4 PK 5 PNU 6 PNI FM 7 IPKI 8 P. REPUBLIK 9 PID 30 PNI MM 31 MURBA 3 PDI 33 GOLKAR 34 PP 35 PKB 36 PUDI 37 PBN 38 MKGR 39 PDR 40 PCD 41 PKP 4 SPSI 43 PNBI 44 PBI 45 SUNI 46 PND 47 PUMI 48 PPI 9

10 APPENDIX The name an the number of political party in Inonesian Legislative General Election PNI PBSD 3 PBB 4 P.MERDEKA 5 PPP 6 PDK 7 PIB 8 PNBK 9 P.DEMOKRAT 10 PKPI 11 PPDI 1 PNUI 13 PAN 14 PKPB 15 PKB 16 PKS 17 PBR 18 PDIP 19 PDS 0 P.GOLKAR 1 P.PAT.PANCASILA PSI 3 P.PERS.DAERAH 4 P. PELOPOR 10

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