Nasdaq Up, Down Volume question

[shaeffer]

Hello,

Can someone clarify what the intraday $UVOLQ, $DVOLQ and $XVOLQ values are? I think they are the cumulative sum of the up, down, and unchanged volumes of each bar in the day.

In the chart below for Aug 26,, the sum of the values for $UVOLQ + $DVOLQ + $XVOLQ = $TVOLQ at the Close (shown) as well as at various points throughout the day. Since TVOLQ is the cumulative total volume, then it seems that U,D and X VOLQs must be cumulative volumes as well.

But if they were cumulative (current value added to sum of previous bars), there should never be drops in the plots since there can never be negative up/down/unchg volumes. Each new volume bar plotted should be as high or higher than the previous bar. Yet there are drops - why is that?

I called Tech Support (Eric O.)and was told each of those volume bars was the volume for the current bar only. That would explain an up volume dip (less up volume in the current bar than the previous). But obviously there was not 1.522B shares traded up in the final 5 minutes.

Regards
Shaeffer

[ACM]

Re: Nasdaq Up, Down Volume question

Shaeffer
You can find the explanation in this article of the eSignal KnowledgeBase
Alex

Originally posted by shaeffer
Hello,

Can someone clarify what the intraday $UVOLQ, $DVOLQ and $XVOLQ values are? I think they are the cumulative sum of the up, down, and unchanged volumes of each bar in the day.

In the chart below for Aug 26,, the sum of the values for $UVOLQ + $DVOLQ + $XVOLQ = $TVOLQ at the Close (shown) as well as at various points throughout the day. Since TVOLQ is the cumulative total volume, then it seems that U,D and X VOLQs must be cumulative volumes as well.

But if they were cumulative (current value added to sum of previous bars), there should never be drops in the plots since there can never be negative up/down/unchg volumes. Each new volume bar plotted should be as high or higher than the previous bar. Yet there are drops - why is that?

I called Tech Support (Eric O.)and was told each of those volume bars was the volume for the current bar only. That would explain an up volume dip (less up volume in the current bar than the previous). But obviously there was not 1.522B shares traded up in the final 5 minutes.

Regards
Shaeffer

[shaeffer]

Thanks for the reply,

I think you are referring to the KB paragraph titled "Why are the $UVOL (up volume), $DVOL (down volume) and $UCHG (unchanged volume) readings rising and falling during the day? "

Although that KB article refers to yesterday (the daily time interval), I assume it also applies to intraday bars? If yes, does this mean that if there were 10 stocks in the index, and at the end of the current intraday time interval 6 of them had closed higher (than their previous bar close) and 4 closed lower, ALL the volume for those 6 stocks would be considered UP volume, and ALL the volume for the 4 stocks would be considerd DOWN volume?

Regards
Shaeffer

PS: should $UCHG really be $XVOL in that article?

[eSignal_AveryH]

shaeffer,

Although that KB article refers to yesterday (the daily time interval), I assume it also applies to intraday bars? If yes, does this mean that if there were 10 stocks in the index, and at the end of the current intraday time interval 6 of them had closed higher (than their previous bar close) and 4 closed lower, ALL the volume for those 6 stocks would be considered UP volume, and ALL the volume for the 4 stocks would be considerd DOWN volume?

Your example would not necessarily be true. All the volume would have to be based on whether or not that current traded price is higher or lower then the previous DAYS close price.

should $UCHG really be $XVOL in that article?

One could argue for or against it, but for simplistic purposes $UCHG gives a better description.