Race Snapshot: Oslo 30/50k Classic


oslo_cl_men oslo_cl_wom

Race Snapshot: Drammen Sprints





Noah Hoffman’s Progress

Like everyone else in the world (seemingly) I enjoy Noah Hoffman’s blog. Apparently he gets a little bit of a hard time for how often he posts, but I think it’s pretty remarkable how much he shares about his training and racing. A lot of athlete blogs will, quite understandably, shy away from sharing some of the lower points during their season. So I was struck by Hoffman’s post following the Sochi 50k in which he was quite open about questioning whether he should remain in the sport at all.

Part of the reason I found it interesting was that for a while now I’ve felt like Hoffman hasn’t been making much progress, and based on what I read elsewhere I don’t seem to be in the majority on that front. Obviously, as a fan of US skiing, I root for him, but form my very distant vantage point looking only at race results, I haven’t seen much sign of the dramatic improvement we’d like to see.

For instance:



This is all of his major international results. So you can see why I’d be puzzled by comments suggesting that his results have improved dramatically. Clearly the last two seasons have seen more good results, but his typical race hasn’t improved all that much, if at all.

Hoffman had an excellent race this past fall in what FIS now calls the pursuit at Kuusamo, and that certainly was noteworthy. But I’ve long felt that you can’t really generalize much from those pursuit races since so many skiers alter their pacing in response to the overall standings. Clearly Hoffman had a good day; I really wish he’d had that effort in an interval start race since that would be a much clearer signal of his ability.

Another example was the Sochi 50k, a race that Hoffman professed some disappointment with. He skied with the leaders nearly the whole race and had some bad luck near the end with a broken pole. On the other hand, by his own description he was basically toast with 5k to go and said that nearly everyone was leaving him behind. In the end he finished a little over a minute off the pace, or about 1.07% back. To say that a minute out in a 50k is pretty good is a bit misleading here. The fact is that modern mass start races (for the men at least) are essentially medium intensity cruisers with several kilometers of mad sprinting at the end.

I often joke that we might as well simply put the whole field on stationary bikes for a set period of time and then have them do a mass start 5k. A little bit more than a minute out in a 5k race doesn’t sound quite so good.

So you might say that I think that percent back in mass start events isn’t necessarily indicative of much. If I had better split data, a more informative metric would be a skier’s pace over the final 5% of the race, not their overall percent back.

Regardless, let’s try to take stock of where Hoffman is. I collected all top 30 men’s results in major international mass start, skiathlon and interval start races (so, yes, I’m dropping those misleading “pursuits”) over the past four seasons. For each person I calculated their median mass start percent back and their median interval start percent back. Here are the results, separated by whether they have ever achieved a top 5 result (in either type of race):



One thing this makes clear is that 1.07% back in the Sochi 50k is actually one of his better results, but it’s also clearly not been the rule. His other two strong mass start results were both held in North America.

All this isn’t meant to just rag on Hoffman. I genuinely hope he succeeds (if you don’t already count was he has done a success). But I was struck by his post-50k blog as being remarkable honest and clear eyed about his progress, which isn’t something I feel like we see very often expressed in public. I also think his coaches are right: he’s got at least two more Olympic cycles in him, and that’s a lot of time to work with. But I can’t say that we’ve seen a dramatic improvement in his race results…..yet.

Race Snapshot: Lahti 10/15k Freestyle





Race Snapshot: Lahti Freestyle Sprint





US Olympic Assessment

So, how did the US do overall at the Olympics this year?

Well, as usual, I’m going to mostly ignore the team events. As I did before, here’s some historical context for our results this time around:



That’s all WSC and OWG results for Americans stretching back to 1992. It’s still kind of hard to swallow the women’s sprint results as a significant improvement, but there you go.

The men’s and women’s distance results both ticked slightly in the wrong direction. However, my suspicions held true and the women continued their steady improvement at the low end. The men are really just in a holding pattern. Basically nothing has changed on that front for about a decade, really.

A friend phrased the question to me in terms of a grade. Personally, if I’m being objective, I’d give the results a B+. Kikkan’s sprint race was a huge disappointment, to be sure, but four women in the top twenty is still quite good and we did put Sophie in the finals. Liz could certainly have had a better 30k, but beyond that I don’t really think anyone significantly under-performed in the distance events compared to what I expected, or thought was reasonable.

On the other hand, (and it’s very hard for me to say this publicly, because Kikkan Randall has been nothing short of revolutionary for the US skiing community), I find it hard not to consider these Games a pretty huge disappointment. But that’s my heart talking, not my head.

Effect of TdS on Olympic Results

Multiple people emailed me asking about whether there was any potential link between whether an athlete participated in the Tour de Ski and their performance at the Sochi Olympics.

Personally, I like dealing with questions like this because they are a great example of how something can both be poor statistical reasoning, but still true at the same time. What could I mean by that?

Well, all of the emails I received made some attempt to list people on both sides: those who skipped the TdS (entirely, or in part) and then seemed to ski well at the Olympics, and those who skied the whole Tour but then seemed not to ski so well at Sochi.

The problem with this sort of thinking is that you have to stop and ask “skied well (or badly) relative to what?”. And that is devilishly hard to establish. For instance, Marit Bjoergen skipped much of the Tour, and then she won 2 gold medals.

But of course, we don’t really know how Bjoergen might have skied in Sochi had she finished the Tour. That would require time travel, or Dr. Who style alternate universes or something. Imagine an alternate universe in which she finished the Tour, and then got the exact same results, under the exact same scenarios, at Sochi. Ask yourself if you’d react to that universe with shock and surprise that Bjoergen skied well enough to win two gold medals (and two bad results from a crash and bad wax) at Sochi after doing the Tour in January. No? I thought not.

So with all my statistical hand waving out of the way up front, here’s a crude way to look at this, as best we can. I took all the top 30 finishers in the individual races at Sochi and collected all their results from 2012-2013 forward. I calculated the difference in the average performance of each skier at Sochi and prior to Sochi (measured by looking at the difference in rank or FIS points compared to each of the skiers in the cohort), and then plotted that relative to the number of stages they started at the Tour de Ski:



Due to the somewhat unfortunate repeated collapsing and then subtracting, negative values here represent doing better at Sochi against this specific cohort of skiers than they had in the previous year and half or so. So if more starts at the Tour had an overall negative effect on performance, you’d see things trending generally upward. But mostly people are just all over the map.

But the key here is that just because we have no evidence of an overall effect, for the whole population on average, that in no way means that specific people weren’t adversely affected by racing deep into the Tour. That’s the key: it’s almost certainly true that some people may have benefited from skipping the Tour, and some people suffered by doing the Tour. But that’s not the same thing as some sort of general, over-arching effect across all people.

I skipped adding any trend lines, because really, the story here is the variation. Sure, you might be able to convince yourself that there’s an effect present for the male sprinters.

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