Help with student grades categorization for ANOVA-n

Question

Douglas Leaffer 2023-6-28

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https://ww2.mathworks.cn/matlabcentral/answers/1989293-help-with-student-grades-categorization-for-anova-n

回答： Sulaymon Eshkabilov 2023-6-28

Grades.mat

Hello. I need some help formatting a table (attached) of student grades for an ANOVA-n analysis. I want to perform the ANOVA-n with outcome (y) as PHS_Grades, which are letter categorical currently, based on multiple factors, such as MAT_Grade (also letter categorical), SEX, ETHNICITY, and AGE (which falls into one of 5 ranges: 0-17; 18-21; 22-25; etc.). I have converted SEX and ETHNICITY to binary variables, but not sure how to code the AGE groups, nor the letter grades from PHS_Grade (outcome) nor MAT_Grade (one factor). Thanks for any help

load Grades.mat; % loads a table named PHS131
p = anovan(PHS131.PHS_Grade, {'SEX'}) % an example category factor
% ERROR OUTPUT:
%Check for incorrect argument data type or missing argument in call to
%function 'isnan'.
%Error in anovan>removenans (line 1183)
%nanrow = isnan(y);
%Error in anovan (line 190)
%[y,allgrps,nanrow,varinfo] = removenans(y,group,continuous);

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Answer 1

Sulaymon Eshkabilov 2023-6-28

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https://ww2.mathworks.cn/matlabcentral/answers/1989293-help-with-student-grades-categorization-for-anova-n#answer_1264393

在 MATLAB Online 中打开

Grades.mat

The variable Grade needs to be numerical values - double or single, then it should work. Also, a small syntax correction with the variable names is needed, e.g.:

load Grades.mat; % loads a table named PHS131

Grade = randi([60, 100], numel(PHS131.SEX), 1); % Grade is a numerical data

p1 = anovan(Grade, PHS131.SEX)

p1 = 0.9555

p2 = anovan(Grade, {PHS131.SEX, PHS131.PREREQ})

p2 = 2×1

0.9443 0.8672