Chapter 367: This feels so sneaky

On Tuesday and Wednesday, Xu Qingzhou spent most of his time familiarizing himself with the data. It's always like this when first starting a project; perhaps it won't be as troublesome once he actually begins the calculations.

Of course, he hadn't fallen behind on his own work regarding the local smoothing conjecture either.

Xu Qingzhou's current idea is to normalize the phase function by transforming ψ^λ(z, h) = φ^λ(z, h), thereby implementing the bilinear oscillatory integral estimation technique.

But honestly, he didn't hold much hope for this approach.

Specifically, this method leads to the same destination as the path once provided by the Indian Statistical Institute that claimed to prove the twin prime conjecture—the computational volume is immense.

He plans to wait until this part is calculated; if the situation remains the same, he will directly start verifying the second scheme.

Furthermore, as he encountered various different materials, Xu Qingzhou also had some new ideas.

Utilizing the Hölder inequality, the initial linear estimation implies bilinear estimation; to a certain extent, this also indicates that the reverse implication relationship requires meticulous analysis.

From the previous sorting, he conceived the idea of using orthogonality techniques to transform the bilinear terms falling within the same scale into the standard form appearing in the lemma.

However, Xu Qingzhou wasn't in a rush; he still intended to proceed step-by-step and wait until the second scheme was tested before deciding.

Inspiration sometimes comes just like that.

After struggling for a long time without finding it, just when one is about to give up, everything suddenly becomes clear.

On Wednesday, Xu Qingzhou decisively ended the first scheme. Although he was a "hacker" (cheat), he couldn't be too stubborn.

Thursday.

The weather was great; the sun hung high in the sky, and the sunlight fell, causing the shadows of the bare branches on both sides of the road to interlace, swaying in the breeze.

With good weather, people's moods were also good. Song Yao walked with light steps, turned her head, and looked at the relaxed-looking Xu Qingzhou: "But, are you sure you won't try again?"

"Yeah, I've given up. Continuing to calculate would be a dead end."

Xu Qingzhou shrugged. He had tried calculating it one more time this morning without giving up, only to find it truly didn't work.

"Even you have times when you give up."

Seeing that the School of Economics was almost there, Song Yao let go of Xu Qingzhou's hand. She always had the feeling that this guy could do anything.

"This is called knowing when to advance and when to retreat, being able to be rough and being able to be fine."

Bang~

Someone was solidly punched.

Song Yao glared at Xu Qingzhou. This guy was just an old lecher; he could drive on any broken road.

"Heh, clearly it's someone's own thoughts..."

Xu Qingzhou muttered in a low voice, the rest of his words suppressed in his throat by a single look from Song Yao.

They arrived at the entrance of the School of Economics.

Song Yao clenched her fists and warned: "After getting to the office, be serious. If you do like last time again..."

Heh, one moment "Song Laoshi," the next "Junior Sister."

Do you really think you're playing roleplay?

"Whoa, Song Laoshi has an idol burden too? I haven't seen it usually..."

It wasn't until Thursday morning that Xu Qingzhou and Song Yao went to the office, which counted as officially starting to participate in the calculations.

Inside the office, everyone was performing their own duties. Li Daiyue was responsible for coordinating the overall work and the driving force analysis part. Song Yao followed along, using econometric methods such as regression analysis and cointegration analysis to quantify the degree of influence of various driving forces on Xia Nation's trade with the US.

Professor Ke Chen was responsible for time series accounting, such as time series analysis and optimization analysis.

For the current calculation part, Xu Qingzhou needed to interface with Professor Ke Chen.

A separate meeting room.

Professor Ke Chen was writing the interfacing content on the whiteboard: "After discussion, the research group decided to use the TRAMO/SEATS method. Through these methods, help us separate seasonal factors from the time series data to obtain adjusted data."

"Long before starting, we had already performed data cleaning, checking for missing values, outliers, or inconsistencies in the data and corrected them all..." Most of the time, Professor Ke Chen was explaining, and Xu Qingzhou would occasionally ask a small question. Since he had promised to come and help, he couldn't be perfunctory; he had to first determine the research group's needs, or rather, the effect they wanted to achieve.

"The above is the research content. Student Xu, for the final goal, we hope that the prediction error of the ARIMA model can be controlled within ±1.5%."

The ARIMA model is the Autoregressive Integrated Moving Average model, used for time series prediction and analysis.

"No problem." Xu Qingzhou nodded slightly.

Professor Ke Chen said with a smile: "You're very confident. You know, the models made by the current leading teams all have errors around 1.5%."

"It doesn't seem to have any difficulty." Xu Qingzhou was already thinking about where to start.

"..."

Professor Ke Chen sighed in his heart: Are you math people all this confident?

Seeing Professor Ke Chen's strange expression, Xu Qingzhou paused and said: "I will try my best to minimize the error."

"Okay." Professor Ke Chen nodded. Regardless, Xu Qingzhou doing math was definitely better than them, these half-baked amateurs. A 1.5% error was the most ideal state; even if it were slightly higher, as long as it was within 2.0%, it wasn't unacceptable.

【In one look...】

This meeting lasted for an hour and a half before ending.

Xu Qingzhou didn't go back; he went to his own workstation to hide.

He was very clear about his work content: modeling time series data to capture its inherent laws and trends, and using signal extraction technology to separate seasonal factors from the time series to eliminate their influence on the time series.

Finally, it was also necessary to combine multiple time series data to perform multivariate analysis and modeling to capture the mutual influence and relationship between different variables.

Everything was clear. The reason he came was that he felt there weren't many opportunities to be in the same office as the "School Beauty" Song.

Office.

Han Shiyi was talking to colleagues about the afternoon's work arrangements, while others were buried in their own work.

On this side, Xu Qingzhou glanced at Song Yao, who was writing something seriously, and whispered: "Student Song, I have a question."

Song Yao stood up, her expression still cold, and walked over.

Xu Qingzhou didn't care about that; his "dog paws" took the opportunity to grab Song Yao's small hand.

There happened to be a file rack on the table, which just happened to block the sight of others.

Song Yao struggled a few times, but Xu Qingzhou held on very tightly. She didn't want to make too large a movement to let others discover it, so she could only stare with her big eyes. However, Xu Qingzhou was calm and composed, pointed at the computer screen, and said with a smile: "What does this place mean?"

Song Yao inhaled secretly, trying hard to calm herself down, and explained to Xu Qingzhou, while her heart was pounding non-stop.

"This part of the content involves the OLI paradigm (Eclectic Paradigm of International Production), roughly meaning that starting from the increasingly consistent international trade and international investment behaviors after the war, it advocates for unified international economic activities..."

Pulling and tugging in the office, so perverted, there is a strange kind of "sneaky feeling."

But very strangely, this sneaky feeling makes people...

Is it just a little bit exciting?

As she spoke, she secretly looked up, saw that others were busy with their own things, and secretly breathed a sigh of relief.

"Oh, so that's how it is..." Xu Qingzhou pretended to suddenly realize, and pointed to another place: "What about this concept?"

Xu Qingzhou's expression was very exaggerated; he definitely knew these concepts, he just purely wanted to take advantage.

Song Yao looked at her boyfriend's appearance and understood instantly, but was helpless. She couldn't just take action here; it would make her seem too violent. She could only endure the annoyance: "This is marginal revenue..."

Xu Qingzhou was of course faking it, thinking happily in his heart: "Song Laoshi's expression of forced endurance is still so heart-moving."

On this side, Han Shiyi was talking while her peripheral vision glanced at the direction of Xu Qingzhou and the other.

Their hands...

So "shippable" (good to ship).

Han Shiyi's heart surged with small excitement again.

(End of chapter) ===== CHAPTER 368 =====