Positive Volume Index - PVI
Categories: Trading
The positive volume index or PVI, is an index that tells us when trading volume is increasing. The premise behind the PVI is this: the more trading volume increases, the more inexperienced newbie investors are making trades. On the flip-side, when trading volume decreases, it's because only the smart and informed investors are making trades (there’s an index for that too, and it’s called the negative volume index, or NVI; together, the PVI and NVI are called “price accumulation volume indicators," which is a mouthful).
So what does this mean for stock prices? Well, as it turns out, the PVI isn’t half bad at identifying bullish and bearish markets. When the PVI is higher than its one-year MA, or moving average, the market is bullish, and prices tend to go up. And when the PVI is below its MA, the market is bearish, and prices tend to go down. It’s not 100% reliable 100% of the time, but it’s definitely an index worth keeping in our investment toolkit.
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Finance a la shmoop... what are moving averages? ooh I need another tissue that [Girl crying]
average I just can't get enough so moving okay yeah yeah that's not at all
what this term is about here's a chart here's a set of trailing averages 50-day
the blue line they're hundred-day the black line and 200-day the green line
there... note that we say trailing average why trailing? well people we lost our
crystal ball yeah Warren we know you took it [Warren Buffett eating dinner]
so averages for normal humans can only be trailing because trailing stockticker
closing prices give us data we can actually use stock averages don't take
future data that we're merely guessing at on their charts... only
real numbers that we can actually point to so here's the 50-day average for [50-day average for coca cola stock]
coca-cola stock KO in 2012 and if we move forward a year and change well here
it's a 50-day average right there looks a little bit different and while the 50
data input elements from its closing price each day vary so the average of
those data points will move and why do moving averages matter well for
fundamental analysts kinds of investors you know the people who care just about [Fundamental analyst people appear]
the cash flow and earnings and margins and revenue growth of companies well
really don't matter but for chartist types of investors that is those who
focus really only about trading trends and shapes and curves and the metrics
behind what patterns of stocks take in the future well, they matter a lot then
in fact the 200-day moving average is generally a kind of Chartist living [Priests in church]
Bible for most Wall Street traders and taking meaning from it is all about
recognizing patterns and then imputing likely future patterns based off of
those shapes for example if you're looking here at the peak of a Head and [Head and shoulders stock price graph]
Shoulders chart, the trailing average of this
say 50-day set here of data points is the line about here but if you move
forward and look at the back half well then the moving average is about here [Moving average lines moves]
and if you consider the entire chart well it's about here and the lines are
there in theory to give color as to what direction the
market or this given stock is heading and yep sometimes it works and sometimes
it doesn't [Man eating dinner with Warren Buffett]