Otoritas moneter sangat menyadari bahwa efisiensi di sektor perbankan merupakan salah satu kunci utama tercapainya stabilitas makro ekonomi dan efektifitas tranmisi kebijakan moneter. Dalam penelitian ini, pendekatan non parametrik Data Envelopment Analysis (DEA) digunakan untuk mengestimasi tingkat efisiensi individual bank umum syariah di Indonesia selama periode triwulan IV:2004 sampai dengan triwulan II:2007. Model panel data digunakan untuk membuktikan hubungan antara pergerakan tingkat bunga Sertifikat bank Indonesia (SBI), dan beberapa variabel makro dan mikro lainnya yang merefleksikan kondisi ekonomi dan karakteristik bank yang mungkin berpengaruh terhadap kinerja bank. Pengukuran efisiensi menggunakan tiga pendekatan yaitu: pendekatan produksi, pendekatan intermediasi dan pendekatan aset. Hasil penelitian membuktikan bahwa selama periode penelitian bank umum syariah di Indonesia belum beroperasi secara efisien, dan tingkat bunga Sertifikat Bank Indonesia tidak berpengaruh secara signifikan terhadap tingkat efisiensi bank umum syariah di Indonesia. Dilain pihak variabel kapitalisasi, CAR dan market power mempunyai hubungan positif dengan tingkat efisiensi, sedangkan variabel inflasi dan NPF mempunyai hubungan negatif.

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Monetary authority recognizes that efficiency in the banking sector is one of contributors to macroeconomy stability and effectivity of monetary policy transmition. In this study, the non parametric Data Envelopment Analysis (DEA) approach is applied to estimate of individual of efficiency of Islamic banks in Indonesia during quarter IV:2004 to quarter III:2007. A panel data model is estimated to prove the relationship between independent variables the interest rate of Sertifikat Bank Indonesia (SBI), and a set of macro and micro variables reflecting business cycle and bank characteristic may affect bank performance. The study has 3 different approaches, the production approach, the intermediation approach and asset approach. The evidence shows during observing periods Islamic banks in Indonesia were not operate efficiently and the interest rate of Sertifikat Bank Indonesia was not strongly correlated with efficiency of Islamic banking operating. On the other hand, variables capitalization, CAR, and market power have positive correlation to efficiency of Islamic bank, furthermore inflation rate and NPF have negative correlation.