i want to compute a cdf for t distribution
2 次查看(过去 30 天)
显示 更早的评论
i want to compute a cdf for t distribution from a to b , i wrote this code but it didn't run
for i=1:50
fa(i)=cdf('t', 'mu' =-2, 'sigma'= 4 , 'nu'= 6 , astar(i))
fb(i)=cdf('t', 'mu' =-2, 'sigma'= 4 , 'nu'= 6, bstar(i))
end
astar and bstar are points of the integral
sorry for a weak my language
0 个评论
采纳的回答
Star Strider
2018-3-1
You are not calling cdf correctly. Also the functions are vectorised, so you do not need the loops.
Try this:
fa = cdf('T', nu, astar);
fb = cdf('T', nu, bstar);
It is probably best to use the tcdf (link) function instead, since cdf appears to be deprecated in a future release of MATLAB.
2 个评论
Star Strider
2018-3-1
My pleasure.
In the t-distribution, ‘nu’ is calculated as described in Compute Student's t cdf (link). You use the mean (‘mu’), standard deviation (‘sigma’) and number of observations (‘n’) to calculate it. There is only one parameter.
If you use my code, you get the correct result:
astar = linspace(1E-5, 2, 5);
nu = 6;
fa = cdf('T', nu, astar)
I again urge you to use the tcdf function (that I linked to in my Answer), instead of cdf.
更多回答(0 个)
另请参阅
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!