Groups in anova1

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Antonie Brozova 2018-6-1

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https://ww2.mathworks.cn/matlabcentral/answers/403532-groups-in-anova1

评论： Antonie Brozova 2018-6-3

Hi everyone, I am trying to use anova1 on data from a table, where I changed some some groups, but for some reason, it uses the old groups. Here is my code

L = pizzasize;
ind = find(L.CrustDescription == 'MidCrust');
L.CrustDescription(ind) = 'Mid';
ind = find(L.CrustDescription == 'ClassicCrust');
L.CrustDescription(ind) = 'Mid';
ind = find(L.CrustDescription == 'ThinNCrispy');
L.CrustDescription(ind) = 'Thin';
ind = find(L.CrustDescription == 'ThinCrust');
L.CrustDescription(ind) = 'Thin';

in the table there is column CrustDescription and I changed the values to have only 3 groups" Thin, Mid and DeepPan. I another column I have store, that sold the pizza, Dominos or EagleBoys and in the last one there is Diameter of the pizza. But when I use anova to Diameters of types of crust of Dominos pizzas, it uses also the crust types I have changed.

indD = find(L.Store == 'Dominos');
[pd, td, sd] = anova1(L.Diameter(indD), L.CrustDescription(indD))
sd = 
    struct with fields:
      gnames: {7×1 cell}
           n: [0 40 0 0 0 42 43]
      source: 'anova1'
       means: [NaN 26.6900 NaN NaN NaN 26.7533 28.8144]
          df: 122
           s: 0.6137