<abstract><p>The numerical solution of an ordinary differential equation can be interpreted as the exact a nearby modified equation. Investigating behaviour solutions by analysing is known backward error analysis. If original and share structural properties, then approximate geometric features such existence conserved quantities. Conjugate symplectic methods preserve form Hamiltonia...

background and objectives: survival models are statistical technique to estimate or predict the overall time up to specific events. prediction is important in medical science and the accuracy of prediction is determined by a measurement, generally based on loss functions, called prediction error. the aim of this study is using parametric models to determine the factors influencing predicted sur...