Empty Data and the Trap of Vietnamese Football Analysis

One April night in Chengdu, I reopened the analysis file I had prepared for a broadcast and found the entire data section contained a single line: insufficient information to assess. No team names, no lineups, no expected goals, no pressing metrics per pass. In my inbox sat three drafts from three young colleagues, and all three had filled that void with numbers that sounded very easy on the ear. One wrote that the home side controlled 63 percent of possession. Another insisted the midfield had been torn apart by a high press. The third quoted a counterattack in the 78th minute that never appeared in any footage I watched. All three drafts flowed well, all had compelling openings, all ended with a tactical recommendation. And all three started from zero. We begin in Chengdu, where the barriers are not as towering as people assume.

Professional football analysis today runs on two tiers. The first decodes a source article into concrete information points: team names, player names, timestamps, numbers. The second uses those points as a foundation for tactical, financial, risk and media analysis. The whole system depends on a single assumption: the first tier must return real data. When that assumption collapses, every tier above it loses its footing.

In Vietnam, V.League 1, the National Cup and the youth system are generating more data than ever before. Statistical platforms track every pass, every duel, every metre of pressing. But alongside that, another habit is growing: write first, verify later. When the first tier comes back empty, an impatient writer will simply create a first tier of their own. That is no longer a technical error. It is a choice, and a choice repeated often enough becomes the unspoken standard of an entire newsroom.

The crux is that data gaps are not rare at all. In an ordinary season, a significant share of matches lack positional data, lack heat maps, and sometimes lack even an official starting lineup. The good analyst is not the one who fills every gap, but the one who knows which gaps must be left alone.

I once called this the reverse snowball effect. An empty information point does not generate false data on its own. It only generates pressure. Pressure from deadlines, from editors who need copy, from fans who need an answer the moment the final whistle blows. When the pressure is great enough, the writer turns assumptions into assertions and possibilities into facts. A line reading 'could' becomes 'did'. A guess becomes a metric. And once a metric is printed, it no longer belongs to the writer — it belongs to the reader's memory.

Based on my experience watching matches across many competitions, I always keep a separate column labelled certainty. Every item in a report is marked high, medium or low. When the first tier returns an empty result, the certainty of every item is zero. The right thing to do is to write the words 'insufficient information to assess' plainly, rather than inventing a number that sounds convincing.

The three-evidence principle I have applied since 2026 states that every tactical claim must be illustrated by at least three specific situations from the match. Three situations, not three sentences. When there are not three situations, the claim is not written. This rule once cost me a column because the piece was too short. It also made my work so hard to challenge that coaches phoned me for advice. Between those two outcomes, I choose the second.

It sounds obvious, yet the reality is the opposite. In sports media, a writer with clear data is often noticed less than a writer who is merely entertaining. A piece without numbers is easily dismissed as bland. A piece with wrong numbers gets read widely. That is the environment that breeds the most dangerous habit of all: preferring the feeling of certainty to the truth. The Russia World Cup taught me that attack is a form of expression, while defence is the answer. The same holds for data analysis. Launching a seductive number is attack. Verifying that number before publication is defence.

The counterintuitive point sits here: an empty result is not a failure. It is the most valuable diagnostic signal a process can emit. When the first tier returns nothing but the words 'insufficient information', that says the machine is being honest, not that it is broken.

The far greater fear is a system that always returns a full, smooth, polished result. Such a system does not prove it works well. It only proves it is programmed to always have an answer. In football, systems like that exist everywhere: prediction tables, team-strength models, transfer reports packed with numbers but no sources. There is a telling detail inside the very process I am describing. The field for involved parties is defined as 'identified from the information points above'. But when the list of information points is empty, that field cannot generate content on its own. The dependency chain breaks at the very first link. Anyone who tries to reconnect it through imagination is corrupting the entire system behind it.

The year 2026 taught me that a team stands firm through its system, not its lineup. The same is true of an analytics desk. It stands firm through its rules for handling empty data, not through the volume of articles it publishes each day. A newsroom that publishes thirty pieces a week without verification rules is building on sand. A newsroom that publishes five pieces, each with a traceable source, is building a foundation. The empty stadium was the largest laboratory modern football has ever had. It showed what remains when all the noise is removed. For data analysis, the equivalent test is to strip away every unsourced number. What remains is the true value of the piece.

The question I want to put to anyone writing about Vietnamese football: when your data source is empty, do you choose silence or do you choose to fill? There is no easy answer. But how you answer will decide how long readers can still trust you. Cultural barriers are not dismantled by words, but by the first match. For a writer, that first match is the first article in which you dare leave a data cell blank, and dare tell your editor that the cell really is empty.