u/055734

[University: Statistics] Help me understand these graphs from a research article?

Hello, I’m not sure if this is against the rules but I need help understanding these graphs. I’ve never taken a statistics class but I have to do a presentation on this article.

Why are there three lines on the graph? What do they mean? What is +1 SD, -1 SD?

Link to article: https://www.ajgponline.org/article/S1064-7481(22)00569-3/fulltext#fig0002

u/055734 — 21 hours ago