Finance, investment, and trading related articles including strategies and analysis.
Scientific framework for iPhone upgrade decisions using Total Cost of Ownership (TCO), depreciation curves, and opportunity costs. Optimize your upgrade cycle from 1-5 years with economic analysis and business ROI calculations for professionals.
iPhone 更換週期科學決策框架：從總體擁有成本（TCO）、折舊曲線到機會成本分析。提供 1-5 年更換週期的經濟學評估與業務效益計算，適合專業人士與投資決策者參考。
ROC (Rate of Change) is a momentum oscillator that measures the speed of price movements by calculating the percentage change between current close and N periods ago. This guide provides comprehensive technical analysis, practical trading strategies, and Python implementation examples to help traders identify reversals, confirm trends, and optimize entry/exit timing.
ROC（價格變動率）是衡量價格變動速度的動量振盪指標，透過計算當前收盤價相對於 N 日前的百分比變化，幫助交易者識別趨勢轉折、確認價格走勢、優化進出場時機。本文提供完整的技術分析、實戰交易策略與 Python 實作範例。
h2 Introduction/h2 p Options Greeks are essential tools for options traders, enabling them to quantify and manage risk effectively. This guide is compiled fr…