Attribution Analysis Focus in Portfolio Management

Mark is a portfolio manager who has recently performed an attribution analysis on his equity fund, which has outperformed the benchmark S&P 500 Index over the past year. In his reports, he identifies various sectors where his stock selections contributed positively to performance. Additionally, he notes that his overweight position in technology stocks, which significantly outperformed the market, was a major driver of returns.

However, Mark is concerned that some of his decisions may have also had negative effects on the portfolio's performance. He decides to analyze his sector allocation decisions separately from his stock selection choices. In this context, what is the most appropriate focus of Mark's attribution analysis?