DER <function of variable x>,<variable x> forms the analytical derivative of the function with respect to <variable x> and writes the result on the next two lines in the edit field. For example, 10 * 11 *DER log(log(1+sqr(Z))) Z 12 * Derivative of log(log(1+sqr(Z))) with respect to Z is 13 * 1/(2*SQR(Z))/(1+sqr(Z))/log(1+sqr(Z)) 14 * 15 *DER SIN(G(t)/t) t 16 * Derivative of SIN(G(t)/t) with respect to t is 17 * COS(G(t)/t)*(t*G'(t)-G(t))/t^2 18 * Survo employs itself analytical derivatives in the ESTIMATE operation for linear and nonlinear regression models and for general Maximum likelihood estimation problems. M = More information on mathematical operations

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