Survival Analysis ECDF

import matplotlib.pyplot as plt
import numpy as np

fig, ax = plt.subplots(figsize=(10, 6), facecolor='#0a0a0f')
ax.set_facecolor('#0a0a0f')

np.random.seed(42)
survival_times = np.random.weibull(1.5, 500) * 365

ax.ecdf(survival_times, color='#a78bfa', linewidth=2.5)

median_survival = np.median(survival_times)
ax.axvline(x=median_survival, color='#fbbf24', linestyle='--', linewidth=2, 
           label=f'Median: {median_survival:.0f} days')

ax.set_xlabel('Time (days)', fontsize=12, color='white')
ax.set_ylabel('Cumulative Probability', fontsize=12, color='white')
ax.set_title('Survival Time ECDF', fontsize=16, fontweight='bold', color='white', pad=20)
ax.tick_params(colors='white')
ax.legend(facecolor='#1a1a2f', edgecolor='#333', labelcolor='white')
ax.grid(True, alpha=0.2, color='white')

for spine in ax.spines.values():
    spine.set_color('#333')

plt.tight_layout()