FARTSSIE v2.7 [Software]

posted by Helmut Homepage – Vienna, Austria, 2021-03-11 21:24 (143 d 10:03 ago) – Posting: # 22260
Views: 785

Hi DShah,

» Still struggling with installation of R in organization …

It’t high time for your organization to learn that you need the right tools to perform your job.

I suppose it is tempting, if the only tool you have is a hammer,
to treat everything as if it were a nail.
  Abraham H. Maslow (Toward a Psychology of Being, 1962)

» … and because of that I had asked for Sample size for NTI- FDA method in excel.

You would need to simulate 100,000 studies in each iteration (cause you will not hit the target with a lucky punch). I don’t say that’s impossible in Excel. But why the hell would one do that, if PowerTOST can give you the result in less than a second?

st <- proc.time()[[3]]
sampleN.NTIDFDA(CV = 0.1, theta0 = 0.975, targetpower = 0.8, design = "2x2x4")
cat("Runtime:",  proc.time()[[3]] - st, "seconds\n")

+++++++++++ FDA method for NTIDs ++++++++++++
           Sample size estimation
Study design:  2x2x4 (TRTR|RTRT)
log-transformed data (multiplicative model)
1e+05 studies for each step simulated.

alpha  = 0.05, target power = 0.8
CVw(T) = 0.1, CVw(R) = 0.1
True ratio     = 0.975
ABE limits     = 0.8 ... 1.25
Implied scABEL = 0.8000 ... 1.2500
Regulatory settings: FDA
- Regulatory const. = 1.053605
- 'CVcap'           = 0.2142

Sample size search
 n     power
14   0.717480
16   0.788690
18   0.841790

Runtime: 0.24 seconds

Dif-tor heh smusma 🖖
Helmut Schütz

The quality of responses received is directly proportional to the quality of the question asked. 🚮
Science Quotes

Complete thread:

 Admin contact
21,596 posts in 4,516 threads, 1,532 registered users;
online 8 (0 registered, 8 guests [including 3 identified bots]).
Forum time: Monday 08:27 CEST (Europe/Vienna)

Imagine if every Thursday your shoes exploded
if you tied them the usual way.
This happens to us all the time with computers,
and nobody thinks of complaining.    Jef Raskin

The Bioequivalence and Bioavailability Forum is hosted by
BEBAC Ing. Helmut Schütz