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#measurement

2 posts tagged with “measurement”.

Stylised illustration of a tea stall at dusk, deep blue sky and a hanging lantern glowing above the counter. At the centre of the counter sits a large kitchen scale holding a tea packet labelled 250 g, its display reading 300 g. On the left a woman in slate blue holds a rubber stamp over a sheet showing five identical stamped marks in a tight cluster, all off to one side of a printed target. On the right a man in saffron holds up a brass compass, its needle pointing at the target's centre. A wooden feedback box with a slot sits at the counter's edge.

Research

Reliability and Validity Walk Into a Tea Stall

Viji's new kitchen scale gives the same reading every single time, and it is wrong every single time. His customer-satisfaction card has the same problem. Two strangers, one with a rubber stamp and one with a brass compass, explain why consistent is not the same as correct.

Vijayakumar P 11 min read
Stylised illustration of a tea stall — Viji stands centre behind his counter, looking up at a four-rung wooden ladder leaning against the back wall. Each rung is capped in a different colour and chalked with a level name (bottom-up: Nominal in earthy brown, Ordinal in gold, Interval in blue, Ratio in green). On the far left a sibling in earthy brown holds up a basket of name-cards labelled m / g / p / l. To the inner left a sibling in gold holds three rosette ribbons numbered 1, 2, 3. To the inner right a sibling in blue holds a small red-bulb thermometer marked °C. On the far right a sibling in green holds a kitchen scale with a 0 prominent on its dial.

Analytics

Nominal, Ordinal, Interval, Ratio Walk Into a Tea Stall

Viji's notebook has four columns. He has tried to take the average of each. Three of them gave him an answer; only one of those answers was meaningful. Four siblings turn up, climb a ladder, and explain why.

Vijayakumar P 12 min read

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