SCTR vrs SMA

Here's a link to how the SCTR is calculated. It uses weighted data from long, medium and short time frames, with long and medium time frames weighted more heavily.

http://stockcharts.com/school/doku.php?id=chart_school:technical_indicators:sctr

You can see the effect of various price movements on SCTR by adding SCTR Line to your chart style.

Also keep in mind that SCTR is a RELATIVE ranking, so that if all stocks in the SCTR class fall, a stock that falls less might maintain a high SCTR score.