# Technical Document Extraction: Performance Metrics vs. Posterior Thresholds
## 1. Image Overview
This image is a dual-axis line chart comparing two performance metrics—**Acc. Rate** (Acceptance Rate) and **Scores**—across a range of **Posterior Thresholds**. The chart also includes baseline markers for two methodologies: **RS** (Random Search) and **Greedy**.
## 2. Component Isolation
### A. Header / Metadata
* **Language:** English.
* **Content:** No explicit title text is present above the chart area.
### B. Main Chart Area (Axes and Labels)
* **X-Axis (Bottom):**
* **Label:** `Posterior Thresholds`
* **Scale:** Linear, ranging from `0.00` to `0.25`.
* **Markers:** `0.00`, `0.05`, `0.10`, `0.15`, `0.20`, `0.25`.
* **Primary Y-Axis (Left - Blue):**
* **Label:** `Acc. Rate`
* **Scale:** Linear, ranging from `3.0` to `3.5`.
* **Markers:** `3.0`, `3.1`, `3.2`, `3.3`, `3.4`, `3.5`.
* **Secondary Y-Axis (Right - Orange/Gold):**
* **Label:** `Scores`
* **Scale:** Linear, ranging from `7.0` to `7.6`.
* **Markers:** `7.0`, `7.1`, `7.2`, `7.3`, `7.4`, `7.5`, `7.6`.
### C. Legend and Baselines
The chart utilizes a non-standard legend format where baseline values are plotted as individual points on the Y-axes.
* **Left Side Baselines (Acc. Rate):**
* **Greedy (Blue Star):** Positioned at approximately `Acc. Rate = 3.05` at `Threshold = 0.00`.
* **RS (Blue Circle):** Positioned at approximately `Acc. Rate = 2.98` (just below the 3.0 line) at `Threshold = 0.00`.
* **Right Side Baselines (Scores):**
* **RS (Orange Circle):** Positioned at approximately `Score = 7.45`.
* **Greedy (Orange Star):** Positioned at approximately `Score = 7.41`.
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## 3. Data Series Analysis
### Series 1: Acc. Rate (Solid Blue Line)
* **Trend Verification:** The line starts at its maximum value and exhibits a sharp downward slope initially. After reaching a local minimum around threshold 0.06, it enters a stabilized oscillatory pattern (a "wavy" horizontal trend) for the remainder of the x-axis.
* **Key Data Points:**
* **Start (0.01):** ~3.50 (Peak)
* **Initial Drop (0.05):** ~3.30
* **Local Min (0.06):** ~3.24
* **Stabilization Range:** Fluctuates between ~3.22 and ~3.30 for thresholds 0.07 to 0.25.
* **End (0.25):** ~3.26
### Series 2: Scores (Solid Orange/Gold Line)
* **Trend Verification:** This series is highly volatile. It shows no singular upward or downward trend but rather a series of sharp peaks and valleys across the entire threshold range.
* **Key Data Points:**
* **Start (0.01):** ~7.05
* **First Peak (0.06):** ~7.38
* **Deep Valley (0.10):** ~7.02
* **Mid Peak (0.14):** ~7.42
* **Deep Valley (0.16):** ~7.08
* **High Peak (0.20):** ~7.55
* **Final Peak (0.24):** ~7.58 (Global Maximum)
* **End (0.25):** ~7.52
---
## 4. Summary of Findings
1. **Inverse Relationship (Initial):** At very low posterior thresholds (< 0.05), the Acceptance Rate is at its highest while Scores are relatively low.
2. **Stability vs. Volatility:** The `Acc. Rate` (Blue) becomes relatively stable after the initial threshold increase, whereas the `Scores` (Orange) remain highly sensitive to specific threshold values, showing significant variance.
3. **Baseline Comparison:**
* The `Acc. Rate` for all thresholds shown (0.01 - 0.25) remains significantly higher than the **Greedy** (~3.05) and **RS** (~2.98) baselines.
* The `Scores` fluctuate around the **RS** (~7.45) and **Greedy** (~7.41) baselines, only consistently exceeding them at specific threshold intervals (e.g., near 0.20 and 0.24).
