what is the value of predicted and actual?

4 次查看（过去 30 天）

MANIMEGALAI SELVARAJ 2017-2-19

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/325791-what-is-the-value-of-predicted-and-actual

评论： Monisha R 2021-10-7

function EVAL = Evaluate(ACTUAL,PREDICTED)
% This fucntion evaluates the performance of a classification model by 
% calculating the common performance measures: Accuracy, Sensitivity, 
% Specificity, Precision, Recall, F-Measure, G-mean.
% Input: ACTUAL = Column matrix with actual class labels of the training
%                 examples
%        PREDICTED = Column matrix with predicted class labels by the
%                    classification model
% Output: EVAL = Row matrix with all the performance measures
idx = (ACTUAL()==1);
p = length(ACTUAL(idx));
n = length(ACTUAL(~idx));
N = p+n;
tp = sum(ACTUAL(idx)==PREDICTED(idx));
tn = sum(ACTUAL(~idx)==PREDICTED(~idx));
fp = n-tn;
fn = p-tp;
tp_rate = tp/p;
tn_rate = tn/n;
accuracy = (tp+tn)/N;
sensitivity = tp_rate;
specificity = tn_rate;
precision = tp/(tp+fp);
recall = sensitivity;
f_measure = 2*((precision*recall)/(precision + recall));
gmean = sqrt(tp_rate*tn_rate);
EVAL = [accuracy sensitivity specificity precision recall f_measure gmean];

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Monisha R 2021-10-7

What was the right code for this?

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Star Strider 2017-2-19

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/325791-what-is-the-value-of-predicted-and-actual#answer_255410

在 MATLAB Online 中打开

From the documenbtation:

% Input: ACTUAL = Column matrix with actual class labels of the training
%                 examples
%        PREDICTED = Column matrix with predicted class labels by the
%                    classification model

I would assume that ‘matrix’ is ‘vector’ here. The ‘ACTUAL’ values are whatever the original classifications are, and the ‘PREDICTED’ the results of your classifier. The values likely depend on the original ‘correct’ classifications and your classifier output.