PCA analysis and percent of the variance explained by each PC

[Denis]

Hi,

I'd like know the total percent of the variance explained by the PC1 and PC2 from the "eigenvalues" file i got after PCA analysis in Tassel GUI (please see in attachment). Which column should i use for that "eigenvalue" or "proportion of total" ? What meaning of the each from these two columns.

What is the PC with zero index (PC0) in the 1-st column of my table ? Is it PC1?

Regards,

Denis

.

[Peter Bradbury]

"Proportion of total" equals the proportion of the total variance explained by each PC axis. It was computed as that eigenvalue divided by the sum of all the eigenvalues. The first PC is PC1 even though its index in the table is zero. The analysis here is written in Java, which uses 0-based arrays instead of 1 based arrays, so 0 is the first PC. 

[Denis]

Dear  Dr. Bradbury,

Thank you so much for your detailed response!

Regards,

Denis

пятница, 11 февраля 2022 г. в 19:40:26 UTC+3, Peter Bradbury: