Name

Niklas Fejes

How many points have you earned?

100/100

How many hours have you spent on this?

6 hours

When did you first start working on this week's learning challenges?

Sunday

What is the most difficult part about this week's challenge?

machine learning, challenge 2

Show and tell (6 points)

Link (2 points)

Multi-Line Voronoi

Write down TWO D3 features you’d like to learn next . (4 points)

Using d3.svg.line to create plots.
More advanced usages of d3.svg.axis(), such as including units and custom labels

MongoDB III

Checkpoints (4 points x 1 = 4 points)

1. (4 points)

Challenges (5 points x 5 = 25 points)

1. (5 points)

> db.aiddata.find({donor:'Belgium'},{recipient:1, disbursement_amount:1})

2. (5 points)

> db.aiddata.find({biodiversity:{$gt:0}},{recipient:1,disbursement_amount:1,title:1})

3. (5 points)

> db.runCommand({distinct: 'aiddata', key: 'flow_type', query: {}})

4. (5 points)

> db.runCommand({distinct: 'aiddata', key: 'flow_type', query: {disbursement_amount:{$gt:100000000}}})

In the query, stats.n is the number of elements used to generate the distinct values. When working with all values this number was 1000859 (all values in the dataset) and with the disbursement limit it was 994, which is the number of entries with disbursement_amount larger than 100'000'000.

5. (5 points)

> db.aiddata.aggregate([ {$match: {donor:'Belgium'}}, {$group: {_id:"$year", total:{$sum: "$disbursement_amount"}}} ])

Machine Learning (II)

Challenge 1 (3 points x 4 = 12 points)

a. (3 points)

b. (3 points)

c. (3 points)

d. (3 points)

Challenge 2 (8 points)

It may be interesting to know whether the precence of the bugs affects the pitch of the phone. Plotting the pitch for each user vs time gives the following plots.

In the plots above, the flat parts are the time when surveys were entered. To get a proper analysis of the different game stages, one would have to separate these into different "events".

What can be seen is that for some of the users, the third game appears to have more "spikey" data. This could be an indication of the bugs in the game.