some confusion about the days of scan

daily sma(20,daily close)>10 vs sma(20, close)>10

no difference; you don't need the "daily" modifier

Today’s min (250,close) vs Yesterday’s min (250,close)

The first looks at the last 250 lows, starting from (and including) today's low

The second looks at the last 250 lows, starting from (and including) yesterday's low.

Note that the "min low" - the lowest low in the last 250 days starting from today or yesterday could be the same value. For instance, the lowest low counting back from today's low might be 10 days ago. That low would be 9 days ago from yesterday's low.


[ today's low < yesterday's daily min(253,low)] vs [today's low < today's min(253,low)]

Same difference as above - today's min and yesterday's min start looking back from different lows, but could still return the same value.

Different people (subscribers) have different notions about how to make the scan language more "user friendly". Some like the "plain language" approach, some like the more "logical" approach. I'm guessing the Stockcharts programmers don't want to be purists, which would send some subscribers away, so they try to make it work for different preferences.