search for: jeka12386

Dear all I am trying to calculate the value of n using uniroot. Here is the message I am having: <<< Error in uniroot(integ, lower = 0, upper = 1000, n) : 'interval' must be a vector of length 2 >>> Please would you be able to give me an indication on why I am having this error message. Many thanks EXAMPLE BELOW: ## t = statistics test from t -distribution

Dear All I am trying to find a uniroot of a function within another function (see example) but I am getting an error message (f()values at end points not of opposite sign). I was wondering if you would be able to advise how redefine my function so that I can find the solution. In short my first function calculates the intergrale which is function of "t" , I need to find the uniroot of

Hi all Dear all, I need to compute boundaries for 3 stages group sequential design with 2 variables using Simpson?s integration method. There is a r program written by Michael A. Proschant et Al. (2006) (Statistical Monitoring of Clinical Trials: A Unified Approach) ? see file attached ? to calculate boundaries for 1 variable only. Does anyone know how this program can be modified to