Category Archives: Uncategorized

2 types of chi-squared test

Most people have heard of chi-squared test, but not many know that there are (at least) two types of chi-squared tests. The two most common chi-squared tests are: 1-way classification: Goodness-of-fit test 2-way classification: Contingency test The goodness-of-fit chi-squared test … Continue reading

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Ohm Energy Referral Competition (2 Dec 2019 – 2 Feb 2020)

Just to share this Ohm Energy Referral Competition. If you are not a Ohm electricity user, sign up using the promo code OHMREF25CC5A now to begin the competition! Also read my blog article explaining why Ohm is the best electricity … Continue reading

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Fixed Ohm vs Ohm Discount

Many people have decided to switch to Ohm electricity, but are still confused which plan to take. The two best plans are Fixed Ohm and Ohm Discount. Personally, I think Ohm Discount is the better one, with this blog post … Continue reading

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Melafix Review and Research

Melafix is quite a popular medication in the aquarium hobby, by the company API. Chances are most people have at least heard about it. However, there is remarkably little information on this medication online, and whatever information is scattered and … Continue reading

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Ohm $20 Promo Code: OHMREF25CC5A

Originally posted on Singapore Maths Tuition:
*Ohm Promo Code: OHMREF25CC5A After extensive research, I find that Ohm is one of the best alternative electricity suppliers. Choose either Fixed Ohm or Discount Ohm depending on your likings. I chose Discount Ohm as…

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Ohm Electricity Review

I have been using Ohm as my electricity supplier since 01 Nov 2018. So far everything has been going 100% super smoothly. Cheaper electricity bills, and integrated billing system with SP services. Ohm has been processing everything efficiently in the … Continue reading

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Aquarium Salt dosage for Planted Tanks

As a general rule of thumb start with 1 tablespoon per 5-7 gallons of aquarium water. This is a safe dose for all fish and plants including salt sensitive corydoras. Source: https://www.ibcbettas.org/aquarium-salt-the-healthy-preventative-v-2-0/ In terms of milliliters, it is approximately: 15 … Continue reading

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Oven Power Trip

Bosch Oven Power Trip Apparently, it is quite common in Singapore (and other tropical countries like Malaysia, Indonesia) that the electric oven cause a power trip (or short circuit) due to the high humidity. Basically, the heating element tends to … Continue reading

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Popular packages in R and Python for Data Science

Most of the time, users of R and Python will rely on packages and libraries as far as possible, in order to avoid “reinventing the wheel”. Packages that are established are also often superior and preferred, due to lower chance … Continue reading

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Recall & Precision vs Sensitivity & Specificity

Other than accuracy rate, there are various metrics for machine learning to measure how “accurate” the model is. Some popular ones for binary classification are sensitivity (true positive rate) and specificity (true negative rate). In computer science, recall and precision … Continue reading

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LaTeX Table Style Guidelines

Drawing LaTeX tables is well known to be quite troublesome. Fortunately, there are some excellent tools online to generate LaTeX code for tables, e.g. Convert Excel to LaTeX. Even after that, there are some stylistic dilemmas, for instance how many … Continue reading

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Express vs Normal Academic for borderline PSLE score

Originally posted on Singapore Maths Tuition:
For students scoring in the borderline of around 190- 200 PSLE score, there is a dilemma of going to Express stream in a neighborhood school, or Normal Academic N(A) in a more established school.…

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Ways To Turn Writing Inspiration Into Money

A good writer is gifted with imagination and the ability to capture the imagination of readers. A lot of these writers begin writing as a hobby. However, some have found a way of converting this hobby into an economic activity … Continue reading

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Singaporean van Gogh – Mr Sim Kah Lim

Originally posted on Singapore Maths Tuition:
This is an amazing story of an amazing artist. His passion for painting is so great, according to his therapist he wants to paint 24/7 without eating or sleeping. I find his paintings of…

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Narrow Leaf Java Fern vs Normal Java Fern

It is well known that the Java Fern has different “varieties” — such as “trident”, “Windelov”, “Narrow Leaf” and “Needle Leaf”. I kept normal Java Fern, as well as “Narrow Leaf” Java Fern in Singapore, at a temperature of around … Continue reading

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How to Balance College and Work and Find Some Spare Time

No one said it would be easy, but if you’re looking for ways on how to balance college and work, use these tips to improve time management. A recent survey revealed that the majority of students work while attending college. … Continue reading

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Bend It Like Beckham: How to Become a Pro Soccer Player

How to Become a Pro Soccer Player Ever wanted to bend it like Beckham? Turns out, you can with the right training and dedication. Read on to learn how to become a pro soccer player. Sure, a lot of people … Continue reading

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Fish at Yale-NUS Eco pond

Some very interesting fish (South American cichlids?) at the Yale-NUS Eco-pond. It is quite an unknown place, located deep inside U-Town. Not many people know of its existence. Do check it out if you pass by NUS. At around the … Continue reading

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How to make work-life balance work (TED talk)

Quotes from the talk: “People are working long hard hours at jobs they hate, to earn money to buy things they don’t need, to impress people they don’t like” A book by the same speaker: Fat, Forty, and Fired: One … Continue reading

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Amazing method to unblock stuffy nose

Originally posted on Singapore Maths Tuition:
Out of all the methods I checked on YouTube, this method seems to be the most effective in terms of instantly unblocking your nose. Basically pinch your nose and sway, until you are almost…

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LaTeX Horizontal Flowchart (Workflow)

Source: https://tex.stackexchange.com/questions/368482/one-horizontal-line-flow-chart?rq=1 Just found an excellent source on how to draw a simple (slightly fanciful) horizontal flowchart using LaTeX (TikZ). The output is very neat: The code is reproduced here (in case the original source gets deleted): \documentclass[tikz, margin=3mm]{standalone} \usetikzlibrary{arrows.meta, … Continue reading

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Chinese Tutor (has experience in tutoring NYGH/RGS/RI students)

Originally posted on Singapore Maths Tuition:
Chinese Tuition Singapore 新加坡华文补习老师 Tutor: Ms Gao (高老师) Ms Gao is a patient tutor, and also effectively bilingual in both Chinese and English. A native speaker of Mandarin, she speaks clearly with perfect accent…

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Amazing method to unblock stuffy nose

Out of all the methods I checked on YouTube, this method seems to be the most effective in terms of instantly unblocking your nose. Basically pinch your nose and sway, until you are almost out of breath, then breath in … Continue reading

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Cai Yun Zhui Yue Piano Sheet Music (PDF)

This is a classical piano tune that is masterfully transcribed (by arranger Wang Jianzhong 王建中). In English, it is also called “Colourful Clouds Chasing the Moon”. In Chinese, it is called 彩云追月. The transcription is really very nice, the harmony … Continue reading

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Taiwan Aquarium Fish Tour

There are many blogs focusing on Taiwan tourism, this blog focuses on the aspect of fish you can see/eat in Taiwan. Koi at Chiang Kai-Shek Memorial Hall If you visit the Chiang Kai-Shek memorial hall in Taipei, do check out … Continue reading

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pip install keeps installing old/outdated packages

This article is suitable for solving the following few problems: module ‘sklearn.tree’ has no attribute ‘plot_tree’ pip install (on Spyder, Anaconda Prompt, etc.) does not install the latest package. The leading reason for “module ‘sklearn.tree’ has no attribute ‘plot_tree” is … Continue reading

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caret package in R: known issue when converting factor variables

In the R language, often you have to convert variables to “factor” or “categorical”. There is a known issue in the ‘caret’ library that may cause errors when you do that in a certain way. The correct way to convert … Continue reading

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Saving Rasbora from Dropsy

Recently, my mosquito rasbora (Boraras merah) was acting weirdly by hiding in a corner and sleeping more than usual. Upon closer examination, I found “specks” on it. At first I thought it was velvet. However, this was an old tank … Continue reading

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Philips Stainless Steel Pressure Cooker

The keyword here is “stainless steel”, because if you look at many pressure cookers, the inner pot is made of aluminum alloy. The bad thing about aluminum is that it is linked to Alzheimer’s disease. For instance, this medical paper … Continue reading

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How to save sklearn tree plot as file (Vector Graphics)

The Scikit-Learn (sklearn) Python package has a nice function sklearn.tree.plot_tree to plot (decision) trees. The documentation is found here. However, the default plot just by using the command tree.plot_tree(clf) could be low resolution if you try to save it from a … Continue reading

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In the northern darkness there is a fish and his name is K’un.

Just realized that there is some parallel between the Chinese Giant Fish Kun (鲲) and the Jewish Giant Fish Leviathan. Similarly, Chinese Giant Bird Peng (鹏) = Jewish Giant Bird Ziz. In the northern darkness there is a fish and … Continue reading

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Singtel Dash Cashback Promo

Singtel Dash Promo Code: Hi! Get up to $2 cashback when you make your 1st  transaction via Singtel Dash! Sign up with this link now – https://appserver.dash.com.sg:443/mgm?DASH-2I2KM .T&Cs apply. 

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6 Things All Mathematicians Do

It can be hard when your child is struggling academically. When kids feel defeated they tend to push against the homework they’ve been assigned and before you know it everyone is upset and they keep falling further and further behind. … Continue reading

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Domain Authority 30

Previously, Page Rank was the more appropriate ranking system for how well a page or domain ranks on Google. However, Google has since temporarily (or permanently?) discontinued Page Rank. Hence, now the closest measure to Page Rank is Domain Authority, … Continue reading

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【纪录片】《统一与兴盛》,中国最棒的历史类纪录片

Probably the best documentary on China’s history to be found on YouTube.

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Recommended Air Purifier for Haze

Recently the Haze in Singapore is getting worse. One can literally smell the burning smell in the air. A recommended cheap and good air purifier for home usage is the Xiaomi Air purifier. Xiaomi is well-known for producing high-tech goods … Continue reading

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Where to park your car, according to math

Originally posted on Math Online Tom Circle:
This “Simple Car Parking” is the Decision Making Strategy demonstrated in our daily life, even in the micro-cell biological level in nature. In the current USA-China Trade War, China Xi is taking the…

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Chen Jingrun–Do You Really Know About the Giant (1)

Originally posted on Quantum Han's Forum:
This time, let’s talk about math; exactly speaking, a mathematician. My favorite things in this world are math and physics. Today, I cannot wait to share with you some stories of Chen Jingrun,…

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Chen Jingrun–Do You Really Know About the Giant? (2)

Originally posted on Quantum Han's Forum:
“Each work of Mr. Chen Jingrun seems as if it is scaling the tallest mountains of the Himalayas. It is perilous [work], but if successful, will certainly affect the world.” (André Weil, Wolf…

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Chen Jingrun Biography Video

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Time, Energy, Money at different phases of life

Hmm… Sad but true? Source: Pinterest

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Singapore Haze & Subgroup of Smallest Prime Index

Originally posted on Singapore Maths Tuition:
Recently, the Singapore Haze is getting quite bad, crossing the 200 PSI Mark on several occasions. Do consider purchasing a Air Purifier, or some N95 Masks, as the haze problem is probably staying for…

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Group of order 56 is not simple + Affordable Air Purifier

Originally posted on Singapore Maths Tuition:
Haze strikes Singapore again, this time it is quite serious as the PSI is often above 300. For those seeking an affordable air purifier, do consider this air purifier which is one of the few…

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Haze affects Wifi Speed?

Recently, Singapore is plagued by the haze, arising from forest fires in Indonesia. This is a common occurrence that happens yearly. Simultaneously, I noticed a drop in Wifi speed both at home and at work. Is this a coincidence? Or … Continue reading

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Advanced Excel Date Editing and Formatting

Suppose you have an Excel file with dates in the format DD/MM/YYYY. So you have entries like 02/03/1999 (2 March 1999). Suppose you want to change it to 2/3/1999, i.e. remove leading zeroes from one digit days and months. It … Continue reading

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How to Score Good Marks in Class 11 Mathematics?

Mathematics is a high scoring subject in class 11 among all the subjects.  Mathematics plays an essential role for all the students to get admission in the best engineering colleges. Even though the students have prepared the problem many times, … Continue reading

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Excellent video on Bishop/Vienna Opening

Bishop’s opening is an excellent opening for White, that is not very well known. It has some dangerous traps like the video below.

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My Neon Tetra 5 Gallon Planted Tank

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Calculate Cronbach Alpha using Python

R has the package “psych” which allows one to calculate the Cronbach’s alpha very easily just by one line: psych::alpha(your_data, column_list) For Python, the situation is more tricky since there does not seem to exist any package for calculating Cronbach’s … Continue reading

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