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Mapping by QGIS or Google Colab (Yiu, 2021) may be complicated to learn, this article therefore introduces Datawrapper to make maps easier.

Datawrapper can be accessed at https://app.datawrapper.de/, it provides three types of maps, viz. (1) choropleth map — Figure 1, (2) symbol map — Figure 2, and (3) locator…


Artificial intelligence (AI) is changing our world rapidly. It does not only help estimate property prices [1] more accurately, but it can now drive our cars [2] , buy and sell stocks [3], and diagnose cancers [4], etc. AI relies on a learning process from the data and contents obtained…


We have discussed how to use geopandas in Colab to use GIS data to plot maps (Yiu, 2021). This article is to use geopandas functions to measure areas of polygons with boundaries and to measure distances between coordinate points.

So we start downloading GIS data with polygon boundaries first. I…


Home buying investment is usually analysed by Net Present Value (NPV) and Internal Rate of Return (IRR). NPV and IRR are common metrics for investment assessment and these functions are also available in Excel or ARGUS (Figure 1).

Figure 1 ARGUS Enterprise 13. http://koreabizwire.com/altus-group-simplifies-commercial-real-estate-asset-and-investment-management-with-powerful-argus-enterprise-13/171759

This article shows an example of building a NPV and IRR e-Analyser…


Mortgage repayment amount is hard to calculate by simple arithmetic as it is not based on a simple interest formula. Nowadays, almost all banks provide free Mortgage Calculators for people to know in advance how much they have to pay every month if they borrow mortgage loans to buy a…


Having written many articles on analytics, I want to make an index article summarising the whole picture and their relationships. First, data analytics is defined as follows:

“Data analytics is the pursuit of extracting meaning from raw data using specialized computer systems. These systems transform, organize, and model the data…


Face recognition is one of the earliest practical applications of artificial intelligence (AI) and machine learning (ML). As fb has started to use face recognition technology a few years ago, it can automatically recognize people (and their names) in photos through machine learning, facial recognition technology has become well known…


Nowadays many online apps are map-based applications, such as Uber, how to map GIS data on a basemap is an important knowledge in developing apps. Very often, data providers would only provide GIS data with coordinates or polygons’ coordinates, and a basemap is required to be layered (matched) to show…


Unlike a scatterplot that can only show the relationship between 2 variables, a Scatter Bubble Chart (SBC) can depict the relationships of three or even four variables. For example, the SBC below shows the relationship between Life Expectancy and GDP per capita in y and x axis, but also using…


Housing rents and prices are well known to be highly correlated and the rent-to-price ratio is commonly coined as the rental yield rate. In schools, students are learned how to apply the knowledge to estimate housing price from rent. …

ecyY

ecyY — easy to understand why, easy to study why. Finding the truths scientifically is the theme.

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