Problem 3: Initially, I encountered inconsistent outcomes when replicating the baseline regression for the primary patenting-size elasticity. This inconsistency arises from M21's use of many-to-many merges during data preparation, rendering the results irreproducible. Each code execution yields a marginally different sample.
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传统模式下，依赖自然降雪的室外项目投资回收周期已超过10年。付雪琰判断，若暖冬成为气候新常态，室外滑雪场的投资前景将面临严峻挑战：一旦有效运营窗口持续压缩，同时造雪频次被迫增加，营收锐减与成本激增双重挤压，投资成本的回收周期将无限拉长。
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