verteilung_alter.png

# ===========================================================================
# MODULE 08 · EDA visualisations (3 figures)
# ===========================================================================
print("[08] EDA-Visualisierungen ...")

# --- 07a: Age histogram (improved) ---
fig, ax = plt.subplots(figsize=(8, 4))
bins = np.arange(18, 100, 5)
ax.hist(survived, bins=bins, alpha=0.72, color=PRIMARY, label="Überlebt",  edgecolor="white", linewidth=0.5)
ax.hist(deceased, bins=bins, alpha=0.82, color=EVENT,   label="Verstorben", edgecolor="white", linewidth=0.5)
ax.set_xlabel("Alter (Jahre)")
ax.set_ylabel("Anzahl Patient:innen")
ax.set_title("Altersverteilung nach 30-Tage-Mortalität")
ax.legend(title=None)
ax.set_xlim(18, 100)

# Annotation box
n_total = len(cohort)
mort_rate = cohort["verstorben_30d"].mean()
ax.text(0.97, 0.95, f"N = {n_total}\n30-Tage-Mortalität: {mort_rate:.1%}",
        transform=ax.transAxes, ha="right", va="top", fontsize=9.5,
        bbox=dict(boxstyle="round,pad=0.3", facecolor="#F0F4F8", edgecolor="none"))

save(fig, ASSETS / "08-eda-visualisierung" / "assets" / "verteilung_alter.png")