Clear Filters
Clear Filters

Can Matlab statistics toolbox look up z/t/z standard tables?

11 views (last 30 days)
I recently plowed through how to do an ANOVA analysis. When I tried to do this via Matlab I found the calculated F quite easily with the anova1(y) function. The next step is to look up the critical F from the standard table (at the back of all high school text books on the subject). I was told that this is not possible!!!! That cannot be true can it? Those standard tables are fundamental to statistics. The person helping me at ML was very clever and found a way of doing this via an equation but is the inability to look up a standard table really not possible in ML?

Accepted Answer

Helen Kirby
Helen Kirby on 10 Sep 2016
Thank you very much SS, that really helped.
  3 Comments
Helen Kirby
Helen Kirby on 11 Sep 2016
Edited: Walter Roberson on 11 Sep 2016
OK, here is a little program which will enable you to get Fc after an ANOVA analysis (which gives you Fs amongst other things):
%%Let us find some Fc's given v1 v2 and alpha
alpha=.05;
prob=1-alpha;
%%input the degrees of freedom
prompt = 'Enter v1: ';
v1=input(prompt)
prompt = 'Enter v2: ';
v2=input(prompt)
%Now get Fc
Fc=finv(prob,v1,v2)
Star Strider
Star Strider on 11 Sep 2016
ttl = 'Inverse \itF\rm-distribution';
dfn = inputdlg('Enter numerator degrees of freedom: ', ttl);
nu1 = str2num(dfn{:});
nfn = inputdlg('Enter denominator degrees of freedom: ', ttl);
nu2 = str2num(nfn{:});
prob = inputdlg('Enter probatility (as decimal fraction, not percent): ', ttl);
pr = str2num(prob{:});
cv = finv(pr,nu1,nu2);
CreateStruct.Interpreter = 'tex';
CreateStruct.WindowStyle = 'modal';
msgbox(sprintf('\\itF\\rm_{(%d,%d)} \\itp\\rm %.3f, CV = %.3f ', nu1, nu2, pr, cv), 'Value',CreateStruct)

Sign in to comment.

More Answers (1)

Star Strider
Star Strider on 10 Sep 2016
I deleted my original Answer (I delete all my Answers if they are not Accepted) so I’ll mention here that I (apparently correctly) linked you to finv and the other appropriate functions that calculate the other distributions and their inverses that you asked about. I left it to you to discover the functions most appropriate to what you need to do, since I was not certain what it was.
  2 Comments
Helen Kirby
Helen Kirby on 11 Sep 2016
Yes, yes, you did indeed include finv. It was I who did not associate an inversion with what I was trying to do (still don't, but never mind) thanks to your guidance all is well. I am trying to Accept your answer, but it seems to be Accepted, I'll try again. Bye.

Sign in to comment.

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!