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...oaches 1, so should the power. However, power.t.test('n'=5,'d'=1,'sig.level'=1) yields a power of 0.9430769. I've compared it to the equivalent function in the 'pwr' package, pwr.t.test, and while power.t.test gives a smooth function with respect to sig.level, it deivates systematically more and more as sig.level is increased. pwr.t.test('n'=5,'d'=1,'sig.level'=1) gives the correct power of 1. 2. I've run empirical simulations and found that the power predicted by pwr.t.test is correct and so it is clear that power.t.test is inaccurate...

...erivative of a polynomial in R i<- -10:10 x<-i*i*i+3*i*i+2 fun_spline<-splinefun(i,x) plot(x,type="l") lines(x,fx_spline(x, deriv=1), col='green') lines(x,fx_spline(x, deriv=2), col='green') Now when I plot 3*i*i + 6*i and 6*i + 6 the plot was not same for first deivative. where as the 2nd derivative was same Is this a correct method for getting derivative. where am I doing wrong as first derivative? lines(x,fx_spline(x, deriv=1), col='green') is not correct. amar -- Amar Kumar Nandan