Reading a scorecard: what strike rate and economy really tell you

Strike rate and economy get quoted as though they settle arguments. Both are useful. Neither means much without the context of when the runs were scored or conceded, and almost every bad cricket argument on the internet comes from ignoring that.

The formulas, first

Metric	Formula	Reads as
Batting strike rate	(runs ÷ balls faced) × 100	Runs per 100 balls
Batting average	runs ÷ dismissals	Runs per time out
Bowling economy	runs conceded ÷ overs bowled	Runs per over
Bowling strike rate	balls bowled ÷ wickets	Balls per wicket
Bowling average	runs conceded ÷ wickets	Runs per wicket

A batter making 40 from 25 balls has a strike rate of 160.00. A bowler conceding 32 from 4 overs has an economy of 8.00. So far, so mechanical. The trouble starts when you compare two of them.

Strike rate needs a phase

A strike rate of 130 in the powerplay, with only two fielders outside the circle and a hard ball coming on, is ordinary. The same figure in the middle overs against spin on a slow surface, with the field spread and the ball soft, is excellent.

Comparing two batters’ career strike rates without asking where in the order they bat tells you almost nothing about who is more effective. An opener and a finisher are doing different jobs under different fielding restrictions against different bowlers, and the number does not know that.

The same trap applies to averages. A number six averaging 28 at a strike rate of 150 may be worth considerably more to his side than a number three averaging 38 at 118, depending entirely on what the team needs from those positions. Averages reward not getting out; some roles require getting out.

The not-out problem

Batting average has a specific distortion worth knowing. Every not-out innings adds runs to the numerator without adding to the denominator. A finisher who is regularly stranded on 20 not out accumulates an average that flatters him, while an opener who is dismissed nearly every innings carries the full cost of every failure.

This is not an argument that averages are useless. It is an argument that comparing a number four’s average with a number seven’s is comparing two different measurements that happen to share a name.

Economy is a shared number

A bowler’s economy is partly a verdict on the bowler at the other end. Sustained pressure from one end produces rash strokes at the other, and the bowler who built the pressure often has the worse figures — because the batter finally decided he had to take a risk, and took it against him.

This is why captains talk about spells rather than returns. Four overs for 30 that included eleven dot balls and forced a wicket at the other end is a better contribution than four for 24 that let a set batter rotate strike comfortably every ball.

Economy is also heavily contaminated by when a bowler bowls. Death overs are more expensive than middle overs by a wide margin, regardless of who is bowling them. A specialist death bowler with an economy of 9 may be substantially better at his job than a middle-overs spinner with an economy of 7.

Better numbers to look at

• Dot-ball percentage. Pressure is built by balls that produce nothing, and this measures it directly rather than through its side effects.
• Balls per boundary. Survives phase and pitch context better than strike rate, because it isolates how often a batter actually finds the rope rather than how many singles he took.
• Wicket timing. Where in the innings a bowler takes his wickets. Two tail-end wickets in the nineteenth over are worth far less than one top-order wicket in the third.
• Boundary percentage conceded. How much of what a bowler gives away comes in fours and sixes as opposed to ones and twos. Two bowlers with identical economies can be conceding in completely different shapes.
• Control percentage. The share of deliveries where the batter played the shot he intended. Broadcasters now show this and it is a far better guide to who is on top than the run rate.

How to read a scorecard properly

Three questions, in order:

1. What phase was it? Powerplay, middle, death. Nothing else means anything until you know this.
2. What was the surface doing? A 160 total on a turner may be a better batting performance than 200 on a road.
3. What did the other end do? Both for batting partnerships and bowling spells, cricket is a paired activity and single-player numbers hide it.

The rule of thumb

None of the better metrics are perfect either. But if you only ever look at strike rate and economy, you will consistently overrate players who arrive at easy moments and underrate the ones who are sent in when the game is hardest.

That is the single most common mistake in cricket argument, and it is entirely avoidable with about ten seconds of extra thought per scorecard.