Sunday, September 20, 2026
Wednesday, September 16, 2026
Sunday, September 13, 2026
Thursday, September 10, 2026
Wednesday, September 9, 2026
Monday, September 7, 2026
Testing the Fragility wrt Methodologies : GDP Issue
Benchmarking Fragility and GDP Measurement
From the perspective of benchmarking fragility, comparing GDP figures derived from two different statistical series is not sufficient by itself to establish which figure is more representative of the underlying economy. The crucial question is whether the measured GDP and its growth rate are robust to the methodology, data construction, weighting scheme, deflators, and reference/base year used to produce the series.
A higher-order sensitivity analysis therefore needs to examine how much the reported GDP figure changes when these underlying measurement choices change. If a significant change occurs, the difference may reflect methodological or reference-point sensitivity rather than a fundamental change in the underlying economic activity.
Thus, the benchmark itself should also be treated as a model whose fragility must be tested. A GDP growth number should ideally be evaluated not only as a point estimate, but also for its stability across reasonable alternative methodologies and reference systems.
In this sense, the key issue is not simply “Which GDP series is correct?”, but rather:
“How robust is the reported GDP figure to the methodology and reference system used to construct it?”
This is the central benchmarking-fragility perspective: a statistical benchmark should not automatically be regarded as methodology-independent merely because it is officially calculated; its sensitivity to the measurement methodology framework should itself be tested.
Based on my published research work earlier
Friday, September 4, 2026
Testing the Fragility wrt Methodologies : GDP Issue
Benchmarking Fragility and GDP Measurement
From the perspective of benchmarking fragility, comparing GDP figures derived from two different statistical series is not sufficient by itself to establish which figure is more representative of the underlying economy. The crucial question is whether the measured GDP and its growth rate are robust to the methodology, data construction, weighting scheme, deflators, and reference/base year used to produce the series.
A higher-order sensitivity analysis therefore needs to examine how much the reported GDP figure changes when these underlying measurement choices change. If a significant change occurs, the difference may reflect methodological or reference-point sensitivity rather than a fundamental change in the underlying economic activity.
Thus, the benchmark itself should also be treated as a model whose fragility must be tested. A GDP growth number should ideally be evaluated not only as a point estimate, but also for its stability across reasonable alternative methodologies and reference systems.
In this sense, the key issue is not simply “Which GDP series is correct?”, but rather:
“How robust is the reported GDP figure to the methodology and reference system used to construct it?”
This is the central benchmarking-fragility perspective: a statistical benchmark should not automatically be regarded as methodology-independent merely because it is officially calculated; its sensitivity to the measurement methodology framework should itself be tested.
Based on my published research work earlier
Wednesday, September 2, 2026
Mathematical Transformation of Reference Point in Time and Economic Transformation of Reference Point in Time May NoT be Exactly the same ! May Not so linear and straightforward!
When one does mathematical transformation of reference point, all things change uniformly but in economic social world, if the reference point is transformed..it can lead to the difference in what abosolute terms are relevant or not ?
So, by changing the reference point relatively, if even absolute figures get changed, then it's not so linear transformation...It's likely higher order non-linear issue !
So, if absolute figure = f(reference point) then things might not be so straightforward linear ! The selection of reference point may not be so arbitrary!
Even Growth % can also be relative... 5% growth rate may not be same in every reference frame in higher order ?!
Statistical figures such as GDP are not directly observed; they are constructed through a measurement methodology and a chosen reference system, such as a base year, price structure, weights, deflators, or aggregation method. If changing the reference system merely rescales the original series linearly, the percentage growth rate remains unchanged. However, when the transformation is non-linear, non-proportional, or changes the underlying weights and methodology, the resulting statistical series can change in a way that also changes the measured growth rate.
Therefore, the robustness of a statistic should not be judged only by its estimation error. It is also important to test its reference-point and model fragility—that is, how much the reported figure changes under reasonable alternative reference points or measurement methodologies.
The broader principle is:
A statistical conclusion may depend not only on the underlying data, but also on the measurement model and reference system used to transform that data into the reported statistic.
Thus, for measures such as GDP, the relevant question is not only “What is the growth rate?”, but also “How robust is the measured growth rate to the choice of reference point and measurement methodology?” That's a deeper question to analyse statistically
Just for educational purpose
Sunday, August 30, 2026
Saturday, August 29, 2026
Wednesday, August 26, 2026
Sunday, August 23, 2026
Saturday, August 22, 2026
Saturday, August 15, 2026
Friday, August 14, 2026
Wednesday, August 12, 2026
Friday, June 19, 2026
Tuesday, June 9, 2026
Thursday, May 28, 2026
Tuesday, May 26, 2026
Monday, May 25, 2026
Game Theory in Real Life : Mathematics
The quote from "A Beautiful Mind," which refers to a concept from game theory, highlights that the best outcome for a group is achieved when individuals consider the group's interests alongside their own. Essentially, it critiques the notion that individual self-interest always leads to the best collective outcome.
Elaboration:
The quote, often attributed to John Nash in the movie, is a variation of the Nash equilibrium concept in game theory. The core idea is that the best outcome for everyone in a group (or a "game") is achieved when each individual not only acts in their own best interest but also considers the best outcome for the entire group.
So, anyone who tries to maximize one's self interest without contributing to the group's collective interest is going to lose in the long run ! It's quite mathematical !
Thursday, May 14, 2026
Randomness in Regression!
Real-world "more" random than regression analysis.
Randomness Asymmetry in backward and forward time !
But Human minds naturally love to think linearly and deterministically !
Saturday, May 9, 2026
Thursday, April 23, 2026
Sunday, April 19, 2026
The basic problem of Economics
(Natural)Resources are limited ...finite, while Human wants are unlimited..infinite !
The mismatch between Unbounded and Bounded functions ! The real problem of Economics !
Human wants will have to remain under control to solve this mathematical problem !
Peace, Happiness, Stress Adjusted GDP /Life
Money may not necessarily buy peace, satisfaction
Economy needs to be Happiness and Stress Adjusted. Higher GDP may not lead to Higher level of Peace and Satisfaction in the world. For example, a village life courl be more peaceful, natural , satisfied even without many latest artificial amenities.
So, India ,given its rich cultural spiritual history, should aim for its future in that perspective rather than blindly chasing wealth GDP without peace , personal satisfaction of people...
Artificial Life may be Naturally Poor and vice versa !
Ministry of Risk Management
There needs to be a separate ministry like Statistics: Ministry of Risk Management
Tuesday, April 14, 2026
Friday, April 10, 2026
In complex environment, sum of individual maximum may not always lead to overall group maximum ! complex game theory !
Real-world systems are far more complex game than typical human intuition/psychology may rationally suggest — where the sum of individual maximization/optimization might not lead to maximal/optimal outcomes for the group That's also one of the fundamental issue with traditional optimizations in complex systems !
In complex systems, many core assumptions of traditional economic theories fail.A clearer understanding emerges when economic/ financial/social real-world systems are analyzed as scientific, dynamic systems rather than relying solely on simplified logic or intuition as usually done !
Detail topic to explore! 🙏
Thursday, April 9, 2026
Skill Vs Luck : Managing Luck is itself a Skill!
Investor 's skill is not actually in generating return..it's about of skill being in the market when market generates return out of luck and randomness over time, which is often understood as skill !
Tuesday, April 7, 2026
Wednesday, April 1, 2026
Saturday, March 28, 2026
Scenario Analysis : Incompleteness
No matter how many scenarios one generates, there will always be more than figured out !
Wednesday, March 18, 2026
Friday, March 13, 2026
Scenario Analysis : Incompleteness
No matter how many scenarios one generates, there will always be more than figured out !
Saturday, March 7, 2026
Godel Incompleteness and Happiness
No matter how much you achieve..reference point if not controlled ..will keep going up ..leading to happiness converting to pain...
There would always be higher reference point to cause pain no matter how happiness..
Happiness is Relative wrt Reference point..not absolute achievement
It depends upon how one sets the reference point...
So control your refe point for optimal happiness not just more and more
Two Types of Strategies : Stress Adjusted Return
There are two types of Strategists :
1. One trying hard to understand the complexity of the things around at the cost of peace.
2. One just managing uncertainty effectively without worrying too much about the complexity all around, with peace !
Stress Adjusted Return matters overall not just return for overall behavioral well being !
As per Global Reports, Stress causing trillions of dollars loss to the global economy !
🙏
Friday, March 6, 2026
Two Types of Strategies : Stress Adjusted Return
There are two types of Strategists :
1. One trying hard to understand the complexity of the things around at the cost of peace.
2. One just managing uncertainty effectively without worrying too much about the complexity all around, with peace !
Stress Adjusted Return matters overall not just return for overall behavioral well being !
As per Global Reports, Stress causing trillions of dollars loss to the global economy !
🙏
Two Types of Strategies : Stress Adjusted Return
There are two types of Strategists :
1. One trying hard to understand the complexity of the things around at the cost of peace.
2. One just managing uncertainty effectively without worrying too much about the complexity all around, with peace !
Stress Adjusted Return matters overall not just return for overall behavioral well being !
As per Global Reports, Stress causing trillions of dollars loss to the global economy !
🙏
Friday, February 27, 2026
Wednesday, February 25, 2026
Saturday, February 21, 2026
Friday, February 20, 2026
Thursday, February 19, 2026
Saturday, February 14, 2026
Wednesday, February 11, 2026
Tuesday, February 10, 2026
Sunday, February 8, 2026
Friday, February 6, 2026
Paradox of Practitioners and Academics
Practitoners criticizing academics follow the academic measures for their own performance analysis e.g. sharpe ratio etc.
Thursday, February 5, 2026
Saturday, January 24, 2026
Friday, January 23, 2026
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