V/AFL CHARTS

This page contains charts with minimal commentary about miscellaneous topics that have grabbed my attention along the way.

All of the charts can be clicked on to access a larger version.

PERCENTAGE OF POINTS SCORED IN EACH QUARTER BY ERA

Data: All games from 1897 to 2017

Topic: Scoring in each quarter of a game as a proportion of the final score in that game

Points of Interest

  • The median for each quarter and for each era is around 25%, as we might expect

  • For the most-recent three eras, however, the tendency has been for there to be a slightly higher proportion of points registered in 3rd and 4th Quarters

  • The spread of percentages is quite large, with up to 60% and in some cases 0% of points in a single game being registered in one of the quarters

RELATIONSHIP BETWEEN CONVERSION RATE AND SCORING SHOTS

By Era

Data: All games from 1897 to 2017

Topic: Relationship between Scoring Shot production and Conversion Rate

Points of Interest

  • Mild evidence that teams generating more Scoring Shots tend to be more accurate

  • Small effect size

  • Not true in all eras

  • More prominent at higher Scoring Shot levels

  • Note that the spread of Conversion Rates reduces with the number of Scoring Shots (ie if we think about conversion as sampling from a Bernoulli distribution, we're seeing the effects of increasing the sample size, n, and so reducing the variance).

By Team in the Modern Era

Data: All games from 2000 to 2017

Topic: Relationship between Scoring Shot production and Conversion Rate for each team

Points of Interest

  • Mild evidence that, for a number of teams in the modern era, their generating more Scoring Shots tends to be associated with their being more accurate

  • Small effect sizes

  • Not true for many teams

  • More prominent at higher Scoring Shot levels for those teams for which it is true

  • Again, note that the spread of Conversion Rates reduces with the number of Scoring Shots (ie if we think about conversion as sampling from a Bernoulli distribution, we're seeing the effects of increasing the sample size, n).

By Venue in the Modern Era

Data: All games from 2000 to 2017

Topic: Relationship between Scoring Shot production and Conversion Rate for each venue where at least 50 games have been played during the Era

Points of Interest

  • Some evidence that, for a number of venues in the modern era, teams that generate more Scoring Shots tend to be more accurate

  • Small effect sizes (and sample sizes for some Scoring Shot counts) at many venues

  • More prominent, if anything, at higher Scoring Shot levels for those venues where it is true

  • Again, note that the spread of Conversion Rates reduces with the number of Scoring Shots (ie if we think about conversion as sampling from a Bernoulli distribution, we're seeing the effects of increasing the sample size, n).