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Originally formed by crystallization from a magma or in metamorphic rocks, zircons are so durable and resistant to chemical attack that they rarely go away.

They may survive many geologic events, which can be recorded in rings of additional zircon that grow around the original crystal like tree rings.

First, I arrange the confusion matrix output for one model in a convenient format.## n precision recall TPR FPR## 1 1 0.06858938 0.07420981 0.07420981 0.0002327780## 2 3 0.04355442 0.14137351 0.14137351 0.0007171045## 3 5 0.03354715 0.18148235 0.18148235 0.0012076795## 4 10 0.02276376 0.24627561 0.24627561 0.0024423093## 5 15 0.01762715 0.28605934 0.28605934 0.0036827205## 6 20 0.01461690 0.31627924 0.31627924 0.0049253407## 1 association rules 1 0.0428 0.0380 0.0380 0.000197## 2 association rules 3 0.0306 0.0735 0.0735 0.000579## 3 association rules 5 0.0266 0.0979 0.0979 0.000944## 4 association rules 10 0.0224 0.139 0.139 0.00179 ## 5 association rules 15 0.0202 0.162 0.162 0.00255 ## 6 association rules 20 0.0188 0.176 0.176 0.00325 ## 7 random items 1 0.000202 0.000219 0.000219 0.000250## 8 random items 3 0.000253 0.000820 0.000820 0.000750## 9 random items 5 0.000242 0.00131 0.00131 0.00125 ## 10 random items 10 0.000222 0.00241 0.00241 0.00250 ## # ... The item-based collaborative filtering model is the clear winner as it achieves the highest TPR for any given level of FPR.

This means that the model is producing the highest number of relevant recommendations (true positives) for the same level of non-relevant recommendations (false positives). do not suggest an item which is highly likely to be purchased).

Like a tiny time capsule, the zircon records these events, each one of which may last hundreds of millions of years.

Meanwhile, the core of the zircon itself remains unchanged, and preserves the chemical characteristics of the rock in which it originally crystallized.

To continue to challenge myself, I’ve decided to put the results of my efforts before the eyes of the data science community.

Zircon contains the radioactive element uranium, which Dr.

Mueller calls “the clock within the zircon” because it converts to the element lead at a specific rate over a long span of time.

Carbon dating has given archeologists a more accurate method by which they can determine the age of ancient artifacts.

Libby invented carbon dating for which he received the Nobel Prize in chemistry in 1960.

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