How to sort a table into five subsets?
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Hi,
I have table with stocks. Now I would like to sort them into subsets according to their size. My goal is to create the 5 subsets according to their size, with each of them holding 20% of the stocks. Unfortunatley I don't know how to do it. The size is the market capitalization. The dataset is attached to the question.
ID is stands for the diffrent stocks
years are the oberved years (1962-2016)
sumMC is the market capitalization of each stock in every year.
Does someone know how to do it?
Thank you in advance
4 个评论
Walter Roberson
2021-4-25
What is the way you decide which stock goes into which subset?
Luca
2021-4-25
Image Analyst
2021-4-25
So what was wrong with the code I posted below? I have about 1/5 of all companies in each groups. Did you want 1/5 or the dollar amount (instead of 1/5 the number of companies) in each group? Please be clear.
Luca
2021-4-25
采纳的回答
Image Analyst
2021-4-25
Just use sort and linear indexing
sortedCaps = sort(marketCap, 'Ascend');
stocksPerGroup = length(sortedCaps) / 5;
% Extract stocks into group #1.
firstIndex = 1;
lastIndex = round(stocksPerGroup);
group1 = sortedCaps(firstIndex : lastIndex);
% Extract stocks into group #2.
firstIndex = lastIndex + 1;
lastIndex = round(2 * stocksPerGroup);
group2 = sortedCaps(firstIndex : lastIndex);
% Extract stocks into group #3.
firstIndex = lastIndex + 1;
lastIndex = round(3 * stocksPerGroup);
group3 = sortedCaps(firstIndex : lastIndex);
% Extract stocks into group #4.
firstIndex = lastIndex + 1;
lastIndex = round(4 * stocksPerGroup);
group4 = sortedCaps(firstIndex : lastIndex);
% Extract stocks into group #5.
firstIndex = lastIndex + 1;
lastIndex = length(sortedCaps);
group5 = sortedCaps(firstIndex : lastIndex);
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