在MATLAB中计算组均值/中位数，其中组ID在单独的列中 [英] Calculating group mean/medians in MATLAB where group ID is in a separate column

问题描述

我有一列包含每个参与者的组ID.一共有三组，因此此列中的每个数字都是1、2或3.

I have one column which contains the group ID of each participant. There are three groups so every number in this column is 1, 2 or 3.

然后我有第二列，其中包含每个参与者的响应分数.我想计算每组中的平均/中位数反应得分.

Then I have a second column which contains response scores for each participant. I want to calculate the mean/median response score within each group.

我设法通过遍历每一行来做到这一点，但是我感觉这是一个缓慢且次优的解决方案.有人可以建议一种更好的做事方法吗?

I have managed to do this by looping through every row but I sense this is a slow and suboptimal solution. Could someone please suggest a better way of doing things?

推荐答案

使用逻辑条件，例如说您的数据位于矩阵m中，如下所示:第一个列为ID，第二个列为响应得分，

Use logic conditions, for example say your data is in matrix m as follows: the first col is ID the second col is the response scores,

mean(m(m(:,1)==1,2))
median(m(m(:,1)==1,2))

将为您提供响应得分中1的平均值和中位数，等等

will give you the mean and median for 1 in the response score, etc

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