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# System prepended metadata

title: WEEK 3 (30-4/12/20)

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# WEEK 3 (30-4/12/20)
## Descriptive Statistics (Mon, 30/11/20)
### Types of data
![](https://i.imgur.com/jx7f7jp.png)
*Qualitative contains:
*Categorical which contains: 
*Nominal (categories have no connection with each other), Ordinal(categories can be ranked)
*Dichotomous: only 2 categories (M or F)

==**Descriptive vs Inferential Statistics**==
* Descriptive: describe sample, no conclusion drawn
* Inferential: hypothesis testing, draw conclusion about populaiton

==**Descriptive Statistics**==
**1. Central Tendency**: identifies a single value as a representative of an entire data
    * Mean (Arithmetic mean): average
    * Median: the middlemost number in a sorted set of data
    * Mode: value that appears the most in a set of data (Bimodal: set of data that has 2 modes)

==**Ad and Dis of Mean, Median, Mode**==
![](https://i.imgur.com/2NGEMz5.png)

**2. Dispersion**: describe how scattered the values are and how much they differ from the mean value
    * Range 
    * Quartiles: values that break down the dataset into quarters
    * IQR: Q3-Q1, describes the middle 50% of values
    * Outliers: values that are far from the middle 
![](https://i.imgur.com/L29LJnL.png)
    * Variance: average of the squared differences from the mean 
    * Standard deviation: Square root of variance
![](https://i.imgur.com/OIDaFzc.png)





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## (Tue, 1/12/20)
### 


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## (Wed, 2/12/20)
### Data Visualization
**==Purpose of data visualization==**: to extract insights, make sense of the data 

**==Types of data==**
1. Qualitative (Categorical)
2. Quantitative (Discrete vs Continuous)

**==Types of visualization==**
* **Univariate**: describe 1 variable only 
    * Histogram: distribution of data
    * Box whisker plot
    * Bar chart
    * Pie chart
    * Line plot
* **Bivariate**: show relationship between 2 variables 
    * Scatter plot
    * Heat map
* **Mulivariate**:multiple variable
    * Breakdown dimension

**==Anatomy of a figure==**
![](https://i.imgur.com/d9IKdIj.png)
**==canvas--->figure--->axes==**


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## (Thu, 3/12/20)
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## Module Test (Fri, 4/12/20)
### 

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