CricViz Analysis – IPL 2018: Mid-Season Match Impact Report

At the half way stage of the IPL season CricViz assesses the performance of the teams and the players so far. 


MATCH IMPACT EXPLAINED 

CricViz’s Match Impact system is a tool for evaluating performance in T20 cricket. Match Impact measures the impact each player’s performance has had on the match score. Performances are measured ball-by-ball using a model of T20 cricket which prescribes a positive or negative run value based on whether the actions of the batsman, bowler and fielder have increased or decreased the expected total.

The expected total is based on a combination of the venue average score & the eventual average score in the match – this way the model accounts for historical tendencies and match-day conditions. By adjusting ball-by-ball the model considers the match situation and the likely nature of play at that stage of the innings. Top order wickets are worth more than lower order wickets; early innings wickets are worth more than late innings wickets; high run rates in the middle overs – when run rates are typically lower – are worth more than high run rates in the death overs, when run rates are typically higher; runs in low-scoring matches are worth more than runs in high-scoring matches.

Fielding Impact is calculated based on the difficulty of the fielding event (catch, run out, stop) and its run value, which for catches and run outs, depends on the the time of the innings at which the event occurred: earlier events are worth more than later events, and for stops it depends on the runs saved or conceded as a direct result of the event.

By aggregating individual player impact the system allows assessment of team performance in different disciplines.


TEAM BATTING 

After their two-year hiatus from the competition, and led by some wonderful performances from their talismanic captain MS Dhoni, Chennai Super Kings top the Team Batting Impact charts. By contrast, fellow returning side Rajasthan Royals have struggled to match CSK’s tally, registering the worst Batting Impact of any side. Despite their position at the top of the table, Sunrisers Hyderabad have struggled to maintain a high Average Impact with the bat, with only Delhi Daredevils and Rajasthan faring worse.


INDIVIDUAL BATTING 

Whilst Kings XI Punjab only rank fourth on the team Batting Impact scale, it’s their two openers KL Rahul and Chris Gayle who top the individual rankings. Perhaps their collective struggles can be attributed to Yuvraj Singh, who registers the second lowest Impact of any batsman to appear three or more times this season.


TEAM BOWLING

Unsurprisingly given the balance of their side, Sunrisers Hyderabad are the emphatic leaders on the collective Bowling Impact chart, accounting for almost 20 runs every match. Of the five bowling units to register a negative match impact, Royal Challengers Bangalore have struggled the most, partly due to some well-publicised difficulties at the death.

 


INDIVIDUAL BOWLING

Yet again, a Kings XI Punjab player stands atop the individual rankings, this time Ankit Rajpoot leading the bowling charts with a considerable lead from Nitish Rana. Barinder Sran drags Kings XI back down to earth with the second lowest Bowling Impact, with only Shahbaz Nadeem registering a lower Average Impact.

 


CricViz are cricket analytics specialists. 

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