# Data Science Tutorial for Beginners

```edn no-exec id=ffcf0396-b3f9-40e6-a0c2-654401879781
{:deps
 {org.clojure/clojure {:mvn/version "1.10.0"}
  org.clojure/data.csv {:mvn/version "0.1.4"}
  generateme/fastmath {:mvn/version "1.3.0-SNAPSHOT"}
  huri {:mvn/version "0.10.0-SNAPSHOT"}
  org.clojure/math.combinatorics {:mvn/version "0.1.4"}
  org.clojure/tools.deps.alpha
  {:git/url "https://github.com/clojure/tools.deps.alpha.git"
   :sha "f6c080bd0049211021ea59e516d1785b08302515"}}}
```

[combats.csv][nextjournal#file#a9665ffd-eb30-44a8-bd86-b47db1be0d06]

[pokemon.csv][nextjournal#file#ba551220-a4f9-458c-a1b6-22dba58b17e2]

[tests.csv][nextjournal#file#64847d9e-32ba-469c-b879-bd2a63016743]

```clojure id=2ba20c09-3e81-4547-81bd-83cba9fd25e7
(use 'clojure.tools.deps.alpha.repl)
(clojure-version)
```

```bash id=980b9f43-aa08-407a-bbea-8fb0620828d4
ls | grep csv
```

```clojure id=44fafaeb-bd13-4e50-841b-5592b72e8b90
(slurp "combats.csv")
```

[result][nextjournal#output#44fafaeb-bd13-4e50-841b-5592b72e8b90#result]

```clojure id=eaefba21-b853-41c0-b149-420190715be7
(require '[clojure.data.csv :as csv]
         '[clojure.java.io :as io]
         '[fastmath.stats :as stats])
```

```clojure id=0c6cbc94-65f3-445a-9f1f-8f02ff915971
(defn csv-reader
  [filename]
  (with-open [reader (io/reader filename)]
    (doall
      (csv/read-csv reader))))

(defn strip [coll chars]
  (apply str (remove #((set chars) %) coll)))

(defn data->maps
  [data]
  (doall
  (map zipmap
       (->> (first data)
         		(map #(strip % " .,"))
            (map keyword)
            repeat)
	  (rest data))))

(defn csv->maps
  [filename]
  (data->maps (csv-reader filename)))
```

```clojure id=17e20cc6-1969-475a-b02c-5b7c40d015bd
(def pokemon (csv->maps "pokemon.csv"))
```

```clojure id=d25671b2-25da-4bd8-8cd1-d86bfda59da0
(first pokemon)
```

```clojure id=1840d75b-f523-4459-9afb-f0bec3fe1af0
(def pokemon 
  (let [nums (map #(select-keys % [:SpDef :Attack 
                                   :Speed :SpAtk 
                                   :# :Defense 
                                   :Generation :HP]) pokemon)
        upvals (fn [m] 
                 (reduce-kv 
                  (fn [m k v] 
                    (assoc m k (Integer/parseInt v))) 
                  {} m))
        ->nums (map upvals nums)]
    (map #(merge %1 %2) pokemon ->nums)))
```

```clojure id=aee93859-595a-4a22-9bde-59543ce19fb3
(first pokemon)
```

```clojure id=9edf65a3-0648-45c3-95f9-0d8364e44ce8
(defn nilify
  [v]
  (if (string? v)
    (when-not (clojure.string/blank? v)
      v)
    v))
```

```clojure id=b823dff2-c730-4508-98b4-6bde9e4df10f
(defn upvals [m f]
    (reduce-kv 
      (fn [m k v] 
        (assoc m k (f v))) 
      {} m))

(def pokemon (map (fn [m] (upvals m nilify)) pokemon))
```

```clojure id=bcfaa153-7602-4231-8c95-a4cf2be60459
(require '[huri.core :as h])
```

```clojure id=6447dce7-727a-4ace-a56a-766c4c88466e
(h/size pokemon)
```

```clojure id=fc4efb50-9929-4ff2-a263-98224cacfe2d
(h/cols pokemon)
```

```clojure id=75c6d7cf-1247-4c90-8fad-2d77e93ca4c6
(defn nilcounter
  [df]
  (let [c (h/cols df)
        dists (map #(h/distribution % df) c)
        nils  (map #(% nil) dists)]
    (zipmap c nils)))
```

```clojure id=866b7d9f-2342-4a90-af54-71879bd72b4a
(clojure.pprint/print-table [(nilcounter pokemon)])
```

```clojure id=5f104232-9a58-4b11-9ef8-3a3aecc7ff2d
(require '[clojure.math.combinatorics :as combinatorics])
```

```clojure id=08fffa5d-8c75-4a3a-88b3-60687efa18f8
(defn cross-corr
  [df numcols]
  (let [pairs (combinatorics/cartesian-product numcols numcols)]
    (for [p pairs]
      (if (apply = p)
        {:keys (vec p) :corr 1}
        {:keys (vec p) :corr (->> df (map #(select-keys % p)) 
                     h/col-oriented vals (apply stats/correlation))}))))
```

```clojure id=b7ee4c0f-8df2-400c-8511-bf0dfb3d3158
(defn heatmap
  [x y z]
  {:data 
    [{:x x
      :y y
      :z z
      :type "heatmap"
      :colorscale [[0 "#24ff24"] [1 "#004b00"]]}]
   :layout {:autosize false :width 600 :height 600}})
```

```clojure id=b6f5d41b-5463-4c60-8d73-b20b014015f9
(def numcols [:SpDef :Attack :Speed :SpAtk 
              :# :Defense :Generation :HP])
```

```clojure id=1850b98c-de23-42e9-b928-e4e6e40c4671
(heatmap numcols 
         numcols
         (->> (cross-corr pokemon numcols)
             h/col-oriented
             :corr
             (partition 8)))
```

[result][nextjournal#output#1850b98c-de23-42e9-b928-e4e6e40c4671#result]

```clojurescript id=51db0ac1-a9e3-4c14-b1b2-dd7452046275
(.plot js/Nextjournal [reference][nextjournal#reference#17a74a33-e1a6-425c-8206-c84f29431fde])
```

```clojure id=761ea4e7-3ca8-4546-b60c-9d19b1c444b6
{:data 
    [{:x (map :# pokemon)
      :y (map :Speed pokemon)
      :type "scatter"
      :name "Speed"
      :opacity 0.6}
     {:x (map :# pokemon)
      :y (map :Defense pokemon)
      :type "scatter"
      :name "Defense"
      :opacity 0.6}]
   :layout {:autosize false :width 600 :height 600}}
```

[result][nextjournal#output#761ea4e7-3ca8-4546-b60c-9d19b1c444b6#result]

```clojurescript id=4d8578cf-8b7c-4558-af2f-47fb3bd3935f
(.plot js/Nextjournal [reference][nextjournal#reference#d530e539-3ef9-4c8a-9bd7-19cf29a23a37])
```

```clojure id=2a11cf06-09b0-45bc-9daa-938ace97fd55
(defn scatter
  [df kx ky]
  {:data 
    [{:x (map kx df)
      :y (map ky df)
      :mode "markers"
      :type "scatter"}]
   :layout {:autosize false :width 600 :height 600}})
```

```clojure id=217fce2c-26d6-4a85-bf78-7bef4e2bbbae
(scatter pokemon :Attack :Defense)
```

[result][nextjournal#output#217fce2c-26d6-4a85-bf78-7bef4e2bbbae#result]

```clojurescript id=b3f37211-6d18-4b96-8d95-785df92c5c5a
(.plot js/Nextjournal [reference][nextjournal#reference#0936ee7c-55b2-4254-8f0a-2037ce9665c5])
```

```clojure id=cd26b26c-fd4c-4e23-a07a-b5ae64646644
(defn hist
  [df kx]
  {:data 
    [{:x (map kx df)
      :type "histogram"}]
   :layout {:autosize false :width 600 :height 600}})
```

```clojure id=43a7d7dc-3954-4287-828a-9f20ddccddac
(hist pokemon :Speed)
```

[result][nextjournal#output#43a7d7dc-3954-4287-828a-9f20ddccddac#result]

```clojurescript id=58f38c75-8dd1-4146-9933-b3678eb22ec2
(.plot js/Nextjournal [reference][nextjournal#reference#e78dfba8-7bf6-44a0-a6f8-a33784d6fadb])
```

```clojure id=49ed32ef-0210-449f-bb1d-f891441db780
(h/rollup :Type1 count pokemon)
```

```clojure id=20297954-bd12-4bde-a9bf-b7da366f11d4
(let [df (h/rollup :Legendary identity :Attack pokemon)]
  {:data 
    [{:y (df "False")
      :type "box"
      :name "False"}
     {:y (df "True")
      :type "box"
      :name "True"}]
   :layout {:autosize false :width 600 :height 600}})
```

[result][nextjournal#output#20297954-bd12-4bde-a9bf-b7da366f11d4#result]

```clojurescript id=5404eb0d-05c7-468a-bc4b-9de83f5aafe5
(.plot js/Nextjournal [reference][nextjournal#reference#dd006a01-44f9-46ad-84b9-963b68a3f88b])
```

```clojure id=8a6a101c-b3ef-4c75-a191-c50ad46c6a31
(map type (vals (first pokemon)))
```

```clojure id=f8783c5a-2584-4190-a715-8702f703f833
(group-by :Name (map #(select-keys % [:Name :Attack :Defense]) pokemon))
```

```clojure id=28dc14bb-e097-4ad1-aa6a-963722e987c5
(def pokemon-clean
  (filter #(not (nil? (:Type2 %))) pokemon))
```

```clojure id=149bae2e-6f6d-40b5-95d9-6814f704f9ed
(h/distribution :Type2 pokemon-clean)
```

```clojure id=dfdcf368-5b26-465d-b467-5a2980a3f1f7
(defn fill-nil
  [row k sub]
  (if (nil? (k row))
    (assoc row k sub)
    row))
```

```clojure id=fd8cb242-e495-49e0-a32b-cd780d9829db
(def pokemon (map #(fill-nil % :Type2 "empty") pokemon))
```

```clojure id=1c55cd83-06b3-4b1a-9eb3-4e241897ffa3
(let [n (map :# pokemon)]
  {:data 
    [{:y (map :Attack pokemon)
      :x n
      :type "scatter"
      :name "Attack"}
     {:y (map :Defense pokemon)
      :x n
      :type "scatter"
      :name "Defense"
      :xaxis "x2"
      :yaxis "y2"}
     {:y (map :Speed pokemon)
      :x n
      :type "scatter"
      :name "Speed"
      :xaxis "x3"
      :yaxis "y3"}]
   :layout {:autosize false :width 600 :height 600
            :grid {:rows 3 :columns 1 
                   :pattern "independent"
                   :roworder "bottom to top"}}})
```

[result][nextjournal#output#1c55cd83-06b3-4b1a-9eb3-4e241897ffa3#result]

```clojurescript id=e60e3b37-567c-4fed-8606-6f322de20b26
(.plot js/Nextjournal [reference][nextjournal#reference#d59945e1-5d33-4383-8e64-a9f2c3eb2496])
```

```clojure id=fc2a5b17-fd13-4595-8e90-d31ab4ef5415
(assoc-in (hist pokemon :Speed) [:data 0 :cumulative] {:enabled true})
```

[result][nextjournal#output#fc2a5b17-fd13-4595-8e90-d31ab4ef5415#result]

```clojurescript id=2cf8e7fd-a4ac-4ce7-882f-4786caa84c88
(.plot js/Nextjournal [reference][nextjournal#reference#939c6938-d31d-4f99-9653-3810a0ede8f9])
```

```clojure id=997a2030-0c2c-4a6b-9ca5-3545f3c6df83
(->> pokemon first :HP)
```

```clojure id=806ac125-7423-4f47-a1be-d939c61d306b
```

[nextjournal#file#a9665ffd-eb30-44a8-bd86-b47db1be0d06]:
<https://nextjournal.com/data/QmZZkdE4WNVPad5qoXFYFNMUWMezy1wdBSBUEGeNNTs3D4?content-type=text/plain&node-id=a9665ffd-eb30-44a8-bd86-b47db1be0d06&filename=combats.csv&node-kind=file>

[nextjournal#file#ba551220-a4f9-458c-a1b6-22dba58b17e2]:
<https://nextjournal.com/data/Qmaaqk1pgXpuTcUCpfaArN48SmCjoSQB9d6Je43yRu8dd8?content-type=text/plain&node-id=ba551220-a4f9-458c-a1b6-22dba58b17e2&filename=pokemon.csv&node-kind=file>

[nextjournal#file#64847d9e-32ba-469c-b879-bd2a63016743]:
<https://nextjournal.com/data/QmTMWG1racvrT82P7rCSACxRGK2i1xq3o38dw4mXdutnrz?content-type=text/plain&node-id=64847d9e-32ba-469c-b879-bd2a63016743&filename=tests.csv&node-kind=file>

[nextjournal#output#44fafaeb-bd13-4e50-841b-5592b72e8b90#result]:
<https://nextjournal.com/data/QmTDTKYfBqZYQHHviAa4xi46ZjSxFcrdDmCSooUiCC3M6F?content-type=application/transit%2Bjson&node-id=44fafaeb-bd13-4e50-841b-5592b72e8b90&node-kind=output>

[nextjournal#output#1850b98c-de23-42e9-b928-e4e6e40c4671#result]:
<https://nextjournal.com/data/QmVnYgNCB6L8GiqJZLSpJf966UyyEAeugDYWiL7E5HpCJC?content-type=application/transit%2Bjson&node-id=1850b98c-de23-42e9-b928-e4e6e40c4671&node-kind=output>

[nextjournal#reference#17a74a33-e1a6-425c-8206-c84f29431fde]:
<#nextjournal#reference#17a74a33-e1a6-425c-8206-c84f29431fde>

[nextjournal#output#761ea4e7-3ca8-4546-b60c-9d19b1c444b6#result]:
<https://nextjournal.com/data/QmQawiwnUzpfyxH7gPbeQ8ZQfQqmWPiBydXDzhsYbt5Fwm?content-type=application/transit%2Bjson&node-id=761ea4e7-3ca8-4546-b60c-9d19b1c444b6&node-kind=output>

[nextjournal#reference#d530e539-3ef9-4c8a-9bd7-19cf29a23a37]:
<#nextjournal#reference#d530e539-3ef9-4c8a-9bd7-19cf29a23a37>

[nextjournal#output#217fce2c-26d6-4a85-bf78-7bef4e2bbbae#result]:
<https://nextjournal.com/data/Qmb7bidazug3Zz8XTziajuZ91hRNQcW4FLTD2ZgTL1gGQ1?content-type=application/transit%2Bjson&node-id=217fce2c-26d6-4a85-bf78-7bef4e2bbbae&node-kind=output>

[nextjournal#reference#0936ee7c-55b2-4254-8f0a-2037ce9665c5]:
<#nextjournal#reference#0936ee7c-55b2-4254-8f0a-2037ce9665c5>

[nextjournal#output#43a7d7dc-3954-4287-828a-9f20ddccddac#result]:
<https://nextjournal.com/data/QmVJAHbm2e4WiPXgVcrnKCRdYWCsEyKJ6kpUXxztcZPU5z?content-type=application/transit%2Bjson&node-id=43a7d7dc-3954-4287-828a-9f20ddccddac&node-kind=output>

[nextjournal#reference#e78dfba8-7bf6-44a0-a6f8-a33784d6fadb]:
<#nextjournal#reference#e78dfba8-7bf6-44a0-a6f8-a33784d6fadb>

[nextjournal#output#20297954-bd12-4bde-a9bf-b7da366f11d4#result]:
<https://nextjournal.com/data/QmR6LqMbiVcActwTcRYMrttuUK2AdN5YDuwP9RqDWqQzWZ?content-type=application/transit%2Bjson&node-id=20297954-bd12-4bde-a9bf-b7da366f11d4&node-kind=output>

[nextjournal#reference#dd006a01-44f9-46ad-84b9-963b68a3f88b]:
<#nextjournal#reference#dd006a01-44f9-46ad-84b9-963b68a3f88b>

[nextjournal#output#1c55cd83-06b3-4b1a-9eb3-4e241897ffa3#result]:
<https://nextjournal.com/data/Qmafr2aHRyydFtvaeRicsdk28xNqcWLb6Bng2A5VbWirKC?content-type=application/transit%2Bjson&node-id=1c55cd83-06b3-4b1a-9eb3-4e241897ffa3&node-kind=output>

[nextjournal#reference#d59945e1-5d33-4383-8e64-a9f2c3eb2496]:
<#nextjournal#reference#d59945e1-5d33-4383-8e64-a9f2c3eb2496>

[nextjournal#output#fc2a5b17-fd13-4595-8e90-d31ab4ef5415#result]:
<https://nextjournal.com/data/QmYzn6vZhFnRi6fjEXjpNmDVjuaJ6PC4aEBeEFjKv4akpt?content-type=application/transit%2Bjson&node-id=fc2a5b17-fd13-4595-8e90-d31ab4ef5415&node-kind=output>

[nextjournal#reference#939c6938-d31d-4f99-9653-3810a0ede8f9]:
<#nextjournal#reference#939c6938-d31d-4f99-9653-3810a0ede8f9>

<details id="com.nextjournal.article">
<summary>This notebook was exported from <a href="https://nextjournal.com/a/KqDYaSXME1XZt4CQtEP8f?change-id=CddGUdNyQXzctV4UDTVMCU">https://nextjournal.com/a/KqDYaSXME1XZt4CQtEP8f?change-id=CddGUdNyQXzctV4UDTVMCU</a></summary>

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