Maybe Fine tune needed in my forecast

Cheung Kung (0001.HK) will annouce final result next week. According to the record that Li Ka Shing kept buying the stock, it is very likely that the result will be a good one. That make me worry that next week it's stock price will raise instead of drop as forecast in my regression chart. Maybe I should use the daily data instead of weekly data to reforecast the trend of the stock.