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Short, plain-language posts on the fundamentals — concepts, methods, and ideas worth coming back to.

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Stylised illustration of a tea stall scene — a wall-mounted chalk slate shows Reena's weekly tea and samosa numbers with Tuesday struck through; Reena is chalking on it; a woman with a tea strainer is approaching from the left and a man with a wooden menu board is approaching from the right.

Analytics

Slicer and Filter Walk Into a Tea Stall

Reena is preparing her slate for her cousin's visit. Some numbers should never be seen, some should be flipped through — and the difference is the difference between a filter and a slicer.

30 Apr 2026 Rani C 6 min read

Stylised illustration of a tea stall owner standing behind his long wooden counter, holding an open notebook with a pen and quietly counting his inventory; a stack of tea glasses on the left of the counter, a plate piled with samosas on the right, a wall clock and a small jar shelf in the background.

Analytics

Correlation and Regression Walk Into the Same Tea Stall

Vijay the tea stall owner needs to know how many samosas to fry tomorrow. Correlation can describe his data, Regression can predict from it — and the difference is the whole story.

28 Apr 2026 Vijayakumar P 6 min read

Stylised illustration of a roadside tea stall — two women on a long bench with cups of tea, one with shopping bags piled around her, the other calm and empty-handed; the tea stall owner pouring tea behind the counter.

Analytics

Covariance and Correlation Walk Into a Tea Stall

Vijay the tea stall owner has a question. Two old friends arrive with two different answers — same idea wearing different clothes.

25 Apr 2026 Vijayakumar P 5 min read

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