MATLAB: Vartestn error line 272

errormatlab functionstatistics

Hi everyone,

I'm trying to make vartestn works but everytime I get :

Unrecognized function or variable 'testname'.
Error in vartestn (line 272)
   Table{k+4,1} = testname;
Error in Statistiques (line 69)
HO_ini(counter,1).data=vartestn([A';B'],'TestType','LeveneAbsolute')

Could someone help me to solve this problem ?

A part of my currently code if it could help :

HO_ini=vartestn([A';B'],'TestType','LeveneAbsolute')

Best,

Thibaut Deville.

Best Answer

Are you trying to use the Levene's tests for data with a single group?

Related Solutions

MATLAB: Putting similar numbers into groups within an array

If you have the Statistics and Machine Learning Toolbox (for pdist2) and the Image Processing Toolbox (for bwlabel), you can do this:

m = [...
7340.1
7340.3
7340.6
7349.0
7349.4
7358.0
7358.1
7358.2
7358.7]
% % New groups would look like follows:
% % Group 1
% 7340.1
% 7340.3
% 7340.6
% % Group 2
% 7349.0
% 7349.4
% % Group 3
% 7358.0
% 7358.1
% 7358.2
% 7358.7]
% First sort m so that close by ones has adjacent indexes.
m = sort(m, 'ascend')
% Get distance of every element to every other element.
distances = pdist2(m, m)
% Find out which pairs are within 2 of each other.
within2 = distances > 0 & distances < 2
% Erase upper triangle to get rid of redundancy
numElements = numel(m);
t = logical(triu(ones(numElements, numElements), 0))
within2(t) = 0
% Label each group with an ID number.
[labeledGroups, numGroups] = bwlabel(within2)
% Put each group into a cell array
for k = 1 : numGroups
  [rows, columns] = find(labeledGroups == k);
  indexes = unique([rows, columns]);
  groups{k} = m(indexes);
end
celldisp(groups); % Display the results in the command window.

It gives you your desired result. Should work for other arrays also, though I didn't test it with any others.

MATLAB: Am I receiving this error when using the vartestn function

In the code you shared, I see 3 inputs and one name-value pair.

vartestn(Table.trialNum, Table.Sex, Table.ID, 'TestType', 'LeveneQuadratic');

The syntax described in the documentation describes a max of 2 inputs followed by name-value pairs.

vartestn(x,group,Name,Value)

Furthermore, from the documentation, x can be specified as a matrix or column vector. If a grouping variable group is specified, then x must be a column vector. So, you have 1 too many inputs.

Decide which variable is your grouping variable and which variable contains the data you're testing.

Best Answer

Related Solutions

MATLAB: Putting similar numbers into groups within an array

MATLAB: Am I receiving this error when using the vartestn function

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