How do I log normalise a set of positively skewed data and find the z scores?

Hi there,

I have a set of positively skewed data (A) that I wish to log normalise before I find the z scores of the data. However, after applying log to my data, the z scores returned with NaN for all indexes.

log_A = log(A);
zscore_A = zscore(log_A);

After taking the log of the data:

After using the z score function:

Am I doing something wrong?

I really appreciate your help! Thank you in advance!

[Jeff Miller]

What are the values in A for which log(A) is -inf?

[Image Analyst]

Please attach A in a .mat file.

save('answers.mat', 'A');

Use the paper clip icon to attach the mat file.