Filling missing values within a group | Data Preprocessing | MATLAB 

Code:
clc
clear all
close all
warning off
ms=readtable('Data.csv');
%Replacing with mean
gs=categorical(ms.Opinion)=='not liked';
% avgei=mean(ms.Age(gs),'omitnan');
% ms.Age(gs)=fillmissing(ms.Age(gs),'constant',avgei);
%Replacing with mode
moda=mode(ms.Age(gs));
ms.Age(gs)=fillmissing(ms.Age(gs),'constant',moda);
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