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Phương Sai Là Gì? Đặc Điểm Và Công Thức Tính Phương Sai Mới 2022

Phương sai là gì? Phương sai được biết đến dùng để đo mức chênh lệch giữa các số liệu trong một tập dữ liệu của bảng thống kê. Phương pháp này rất hữu dụng trong việc xây dựng các mô hình thống kê chi tiết và có tính ứng dụng cao.
Để tìm hiểu chi tiết hơn phương sai cũng như ý nghĩa, công thức tính của nó. Mời các bạn theo dõi ngay bài viết sau của VNCash24h nhé!

Phương Sai Là Gì?

Phương sai còn được gọi là Variance, có ký hiệu (σ2) trong thống kê. Đây là một bảng số liệu thể hiện sự đặc trưng của độ phân tán các số liệu trong tập dữ liệu so với giá trị trung bình. Nếu phương sai thể hiện giá trị nhỏ nghĩa là bộ số liệu đó có các giá trị gần với giá trị trung bình.
Trong đầu tư tài chính, phương sai lợi nhuận của các tài sản trong một danh mục đầu tư được sử dụng như một phương tiện để phân bổ tài sản một cách tốt nhất.
Phương trình phương sai, trong đầu tư tài chính là công thức để so sánh hiệu quả của các thành phần trong danh mục đầu tư với nhau và so với giá trị hiệu quả trung bình.
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