Term
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Definition
| The set of all people, leaves, things, ideas etc. that scare a defining trait |
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Term
| What do populations consist of? |
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Definition
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Term
| What is a subset of population called? |
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Definition
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Term
| What is a data set called? |
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Definition
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Term
| When do we use descriptive statistics? |
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Definition
| When we have a sample, or a census, and only want to describe the units in that specific data set. (Roman letters). |
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Term
| When do we use parameters? |
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Definition
| When calculating populations. (Greek Letters). |
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Term
| What do we use when you have a sample and want to say something about it? |
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Definition
A inferential statistic
or inference.
Inference is less useful though because it only consists of hypothesis testing about whether statistics can say something about parameter values. |
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Term
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Definition
Can be used for classification purposes only.
Cant use mathematical transformations. |
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Term
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Definition
Can be used for classification and ranking/ordering.
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Term
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Definition
Allows us to classify, and assign rank.order, but not distance is a meaningful concept because the distance between possible data points is in a constant uniform scale.
Can add and subtract. |
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Term
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Definition
Adds to features that interval data doesn't have. Absolute zero exists meaning the absence of some feature. Ratios are meaningful and constant.
Multiply and devide |
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Term
| How do you know the difference between Ration and Interval Data? |
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Definition
Find out what the zero means.
If the zero means the absolute absence of a variable, then its ratio data.
If the zero is a baseline and doesn't mean the absence of the variable then its interval data. |
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Term
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Definition
| Where each unit is observed once and there are multiple attributes about each unit recorded. The data is collected at the same time and you never observe the same unit more then one point in time. |
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Term
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Definition
| Where you observe one unit with one attribute, but you observe it at many different points in time. |
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Term
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Definition
| Where each observable unit has several attributes and is observed at multiple points in time. |
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Term
| What is parametric statistics? |
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Definition
| When we are working with quantitative data then the statistics |
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Term
| When working with qualitative data you are limited to? |
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Definition
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