Skip to content

crosstab: add categorical vector input support #351

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
beingamanforever wants to merge 1 commit into
base: main
Choose a base branch
from
Open

crosstab: add categorical vector input support #351

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
27 changes: 24 additions & 3 deletions inst/crosstab.m
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -28,7 +28,8 @@
## Create a cross-tabulation (contingency table) @var{t} from data vectors.
##
## The inputs @var{x1}, @var{x2}, ... @var{xn} must be vectors of equal length
## with a data type of numeric, logical, char, or string (cell array).
## with a data type of numeric, logical, char, categorical, or cell array of
## strings.
##
## As additional return values @code{crosstab} returns the chi-square statistics
## @var{chisq}, its p-value @var{p} and a cell array @var{labels}, containing
Expand All @@ -53,8 +54,8 @@

for i = 1:nargin
vector = varargin{i};
## If char array, convert to numerical vector
if (ischar (vector) || iscellstr (vector))
## Convert char, cellstr, or categorical to indexed numeric vector
if (ischar (vector) || iscellstr (vector) || iscategorical (vector))
try
[vector, gnames] = grp2idx (vector);
catch
Expand Down Expand Up @@ -145,3 +146,23 @@
%! y = [1, 2, 3, NaN];
%! t = crosstab (x, y);
%! assert (t, [1, 0, 0; 0, 1, 0]);

## Test categorical input
%!test
%! x = categorical ({'A', 'B', 'A', 'C', 'B'});
%! y = [1, 2, 1, 3, 2];
%! t = crosstab (x, y);
%! assert (size (t), [3, 3]);
%! assert (t(1, 1), 2); # A with 1
%! assert (t(2, 2), 2); # B with 2
%!test
%! x = categorical ({'low', 'med', 'high', 'low', 'med'});
%! y = categorical ({'X', 'Y', 'X', 'Y', 'X'});
%! [t, ~, ~, labels] = crosstab (x, y);
%! assert (size (t), [3, 2]);
%!test
%! ## Test categorical with numeric
%! x = categorical ([10, 20, 10, 30, 20]);
%! y = [1, 2, 1, 3, 2];
%! t = crosstab (x, y);
%! assert (t, [2, 0, 0; 0, 2, 0; 0, 0, 1]);