This article proposes a method for modeling and classification apply on the uterine contractions in the electromyogram (EMG) signal for the detection of preterm birth. The frequency content of the contraction changes from one woman to another and during pregnancy. Firstly we apply an AR model on the Uterine EMG signal for the calculation of the a_i parameters. Wavelet decomposition is used to extract the parameters of each simulated contraction, and an unsupervised statistical classification method based on Fisher test is used to classify the signals. A principal component analysis projection is then used to evidence the groups resulting...