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NF = Nasty Factor.

What is the Nasty Factor?

The Nasty Factor evaluates several properties of each pitch, and rates the "nastiness" of the pitch on a scale from 0-100, based in part on the success or failure of opposing hitters against previous similar pitches. The Nasty Factor incorporates several different factors for each pitch, including:

Velocity - The greater the pitch's velocity - as compared to that pitcher's and the league's range of speed for that pitch type - the greater the nastiness;

Sequence - The more the pitcher mixes up his pitches, the greater the nastiness… and certain pitch sequences are nastier than others, too;

Location - The closer to the edges of the strike zone is, the greater the nastiness, while pitches closer to the middle of the plate, and farther away outside the strike zone, decrease in nastiness;

Movement - The more movement the pitcher applies to the pitch - as compared to that pitcher's and the league's range of movement for that pitch type - the greater the nastiness.

The Nasty Factor also adjusts for how often the pitcher has faced the current batter during the game, as well as how often he has used the same pitch type against the same batter in the current at-bat and previously in the game.

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12y ago
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11y ago

NF' in MLB stands for 'Nasty Factor'. The Nasty Factor evaluates several properties of each pitch, and rates the "nastiness" of the pitch on a scale from 0-100, based in part on the success or failure of opposing hitters against previous similar pitches. The Nasty Factor incorporates several different factors for each pitch, including: Velocity, Sequence, Location, and Movement. The Nasty Factor also adjusts for how often the pitcher has faced the current batter during the game, as well as how often he has used the same pitch type against the same batter in the current at-bat and previously in the game.

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12y ago

It stands for "nasty factor" - on MLB.COM anyway.

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11y ago

Nasty factor. What the hell that means is anyone's guess.

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Q: What does NF stand for on MLB gameday?
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