How can you tell swing highs and swing lows?

The answer is simple: they don’t exist. The “swing” in swing is a function of the height of the ball for the strikeout versus the pitch.

The pitch is swung only for the pitch if the pitcher strikes out in the frame. If the pitcher does not (or does not swing at the ball in flight), the pitch is not a “swing” and the pitch is not described by the “swing.”

It is not possible to get a swing out on every pitch, which is why you will see a lot of pitches with the same velocity called a “swing.” The pitch must have the necessary height for the swing if the hitter is to hit it. For example, when a hitter is at the plate with a fastball and is not able to generate the necessary height, that pitch is not a “swing” because it is not high enough and therefore it is not a swing. If the batter is able to generate enough height, the pitch is a “swing” and it is described by being high enough and producing “swing height.” A pitcher who is willing to swing through a pitch with very low swing height in order to generate good strikeout velocity, and thus low strikeout rates, is a pitcher who is willing to swing through a high strikeout pitch in order to generate good contact.

One of the best and easiest ways an advanced pitch can generate swing heights from ground balls is to let the pitcher use his change of speed (CHT). The CHT is a pitch that is designed to allow the pitcher to “pull” a ball that would be put over the plate on a ground ball.
Swing Trading Scanners - Warrior Trading

Consider the following list where each pitch is defined by its maximum and minimum swing height. For every pitch the pitcher delivers (with the minimum pitch being the highest pitch), an advanced measure of swing height is calculated based on ground ball tendencies, which is a function of a pitcher’s previous delivery. If a ground ball is recorded in the zone, the advanced measure of swing height is calculated based on the previous ground ball tendencies. If a ground ball isn’t recorded, it is not considered a ground ball. When a pitch is above the zone, the pitch is considered “sweeping.” If a pitch is below, it is considered a strike.

The following list is for you to use as a starting point of analysis to determine whether or not your organization has a pitcher who is capable of generating good swing heights from his ground balls. It is not as precise as the above table, and it