# Statistics and Efficiency · バレーボール, レベル6：上級

バレーボール · レベル6：上級 · Insporta Book (https://book.insporta.app/ja/volleyball/level-6/statistics-and-efficiency/)

Statistics and Efficiency: 事実100件, テスト10件.

Attack efficiency and kill percentage, figures per set, errors, block statistics, the setter's numbers, small samples, comparing players fairly, team statistics after a match and statistics in practice.

## テスト 1: Attack efficiency

- A blocked attack costs the point, so it counts against the hitter. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Efficiency subtracts errors, so it shows what each swing was worth. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- (12 - 4 - 2) / 30 = 6 / 30 = .200. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Below zero means her errors outweighed her kills. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Hitters who get the high balls from bad passes face bigger blocks. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Out-of-system balls meet a well-formed block. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- A hitter may score well in some rotations and poorly in others. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Count, subtract, then divide. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Higher numbers mean more points per swing. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Efficiency is kills minus errors and blocks, over attempts. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)

## テスト 2: Kill percentage

- Kill percentage is the share of swings that scored. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Kill percentage ignores errors and blocked attacks. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- 15 / 30 = 0.5, or 50%. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- The gap between them reveals how many swings went wrong. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Quicks from good passes often score at a high rate. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Quick sets depend on a pass close to the net. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Two kills in two swings is 100% but says little. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Same attempts, so more kills means a higher percentage. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Efficiency includes errors; total kills ignores attempts too. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Equal kills, fewer errors: higher efficiency. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)

## テスト 3: Figures per set

- Per-set figures make players comparable. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- 12 / 4 = 3 blocks per set. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Award rankings such as best blocker use averages per set. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- A single good or bad set can distort an average. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Aces per set show who scores most from the line. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- A 15-point fifth set lowers the average per set. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Soft shots go over or around the block instead of into it. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- 2.5, 1.5 and 1.0 blocks per set. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Total, sets, then divide. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Award tables for blocking rank players by average per set. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)

## テスト 4: Errors

- Fewer mistakes usually mean a team has found its rhythm. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- An unforced error comes from an easy situation. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- A large share of points are given away by mistakes. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Tough serving brings misses but also aces and poor passes. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- A risky serve and a forced attack need different fixes. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Shots and tools can replace risky hard hits. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Points from opponents' errors were given, not won. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Risky serves are accepted; a rotation fault never helps. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Count, find, train and recount. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- More errors than kills hands points to the opponents. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)

## テスト 5: Block statistics

- A stuff block ends the rally with a point. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- A touched ball is slower and easier to dig. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Fast sets beat the block before it can form. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Middles block in all three front-row rotations across the net. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- A block that takes away shots helps diggers win rallies. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Faults while blocking count as block errors. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- A low opponent efficiency shows the block and defence did their job. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- From a point to a fault. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Middles block most; small setters block least. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- A shared stuff block is often split between the blockers. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)

## テスト 6: The setter's numbers

- Good passes allow quick, hard-to-block sets. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Without a kill, a good set earns no assist. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Distribution shows how well the setter reads the game. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Good sets lead to higher efficiency for her hitters. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Easy kills raise assists whatever the set quality. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Distribution is how she spread her sets. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Using the middle stops the block from leaning outside. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Pass, set, kill and the assist. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Choices show decisions; assists depend most on hitters. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- A set leading to a kill is an assist. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)

## テスト 7: Small samples

- A few appearances give too little data to judge. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- A handful of swings cannot show a true level. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Over many serves her rate will settle much lower. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- More data gives a steadier picture. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Scoring against a weak block is easier. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- One match may not reflect real progress. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Context such as set quality is not always in the numbers. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- More data means more trust. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Notice, count, compare and watch. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- A single set is the smallest sample. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)

## テスト 8: Comparing players fairly

- Passing quality is the heart of the libero's job. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Per-set and efficiency figures adjust for playing time. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Bad passes lead to high balls against full blocks. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- A high rating on few balls means less than on many. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- A setter fed poor passes cannot run fast plays. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Blocking and drawing blockers are not counted as kills. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Numbers mean more when read against each player's job. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Same role and a fair measure is best; different roles, worst. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Role, fair figure, context, then compare. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- A libero does not attack, so kills do not show her value. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)

## テスト 9: Team statistics after a match

- Failing to side out usually explains a loss. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- The better attacking team often wins. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Points also come from serving, blocking and opponents' errors. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Predictable sets let the block form in time. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Points won on serve, against errors made, sum up the serving. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Errors can cancel out a team's kills. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Players can work on a short list of clear points. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Side-out, attack, serve and block, then priorities. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Attacks score most; aces are usually fewest. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- The split shows each skill's share of the team's points. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)

## テスト 10: Statistics in practice

- One quick number per pass keeps the drill moving. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- A number gives the drill a goal to reach. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Seeing progress encourages players. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Slow recording would interrupt the drills. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Steady passing in practice predicts match passing. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Some players do better in practice than in matches. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Someone off the court can mark a few numbers. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Skill, target, record and review. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- A higher average is harder to reach. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)
- Practice numbers show whether skills improve. (出典: FIVB Coaches Manual (Levels I-II), FIVB statistics, general coaching references)

出典: FIVB Coaches Manual (Levels I-II) and general coaching references; original questions authored, nothing reproduced. Numbered FIVB rules belong to the Rules category.

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