Core equity valuation ratios used to screen for deep-value stocks: price-to-earnings,
price-to-book, earnings yield, EV/EBIT, and dividend yield. Pure Rust, no deps.
The same signals behind the [DeepValueRadar](https://deepvalueradar.com/) value screener.
```rust
use value_metrics::*;
let pe = price_to_earnings(100.0, 5.0); // 20
let ey = earnings_yield(5.0, 100.0); // 0.05 (1/pe)
let pb = price_to_book(50.0, 25.0); // 2.0
```
License: MIT