# v1.8.0 - A/B测试与定价优化

## A/B测试框架

```go
type Experiment struct {
    ID          string
    Name        string
    Variants    []Variant
    TrafficSplit []float64  // [0.5, 0.5]
}

type Variant struct {
    ID       string
    Name     string
    Price    float64
    Features []string
}

func (s *SubscriptionManager) GetPriceForUser(ctx context.Context, userID int64, planID int) float64 {
    // 获取用户所在的实验组
    variant := s.getUserVariant(ctx, userID, "pricing_experiment")
    
    if variant != nil {
        return variant.Price
    }
    
    // 默认价格
    return s.getDefaultPrice(planID)
}

func (s *SubscriptionManager) TrackConversion(ctx context.Context, userID int64, variantID string, converted bool) {
    s.analytics.TrackEvent(ctx, "subscription_conversion", map[string]interface{}{
        "user_id":    userID,
        "variant_id": variantID,
        "converted":  converted,
    })
}
```

## 定价实验分析

```go
func (a *Analytics) AnalyzePricingExperiment(ctx context.Context, experimentID string) (*ExperimentResult, error) {
    // 计算各组转化率
    result := &ExperimentResult{}
    
    for _, variant := range a.getVariants(experimentID) {
        stats := a.getVariantStats(ctx, variant.ID)
        
        result.Variants = append(result.Variants, VariantStats{
            ID:            variant.ID,
            Visitors:      stats.Visitors,
            Conversions:   stats.Conversions,
            ConversionRate: float64(stats.Conversions) / float64(stats.Visitors),
            Revenue:       stats.Revenue,
        })
    }
    
    return result, nil
}
```