How to divide a dataset into two subsamples?

Question

IvyR 2023-2-14

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1912255-how-to-divide-a-dataset-into-two-subsamples

编辑： Antonios Dougalis 2023-2-14

Hello,

Im trying to partition a datset into two subsamples. Unfortunately, I'm struggling to code it.

How do I divide a datset into two subsamples, one corresponding to those Losses that involved a LAWYER (=1) and the other to those in which a LAWYER was not involved (=2).

1 Lawyer LOSS

1 1 612

2 2 453

3 1 188

4 2 811

5 1 695

6 2 215

7 1 684

8 1 354

9 1 743

10 2 246

I tried to write the code in Matlab like this;

%Claims that a Lawyer is involved (=1)

LOSS_1=LOSS;

LOSS_1=LOSS(ATTORNEY(:,2)==1)

When I try to run it, I keep getting errors. What is the correct way of coding this. Thank you.

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Answer 1

Antonios Dougalis 2023-2-14

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https://ww2.mathworks.cn/matlabcentral/answers/1912255-how-to-divide-a-dataset-into-two-subsamples#answer_1171195

编辑：Antonios Dougalis 2023-2-14

在 MATLAB Online 中打开

% Suppose that you have an array A with two columns (lawyer, loss)
A = [ [1;2;1;2;1;2;1;1;1;2], [612;453;188;811;695;215;684;354;743;246] ];
lawyer1 = find(A(:,1)==1); % indexes of the rows that are 1 corresponding to lawyer 1
lawyer2 = find(A(:,1)==2); % indexes of the rows that are 2 corresponding to lawyer 2
% use the indexes to extract the losses for each lawyer from the second
% column of A
loss_lawyer1 = A(lawyer1,2);
loss_lawyer2 = A(lawyer2,2);