Practical note book work (Biostat)

[Arosa Hya]

Data:

Data is a set of observations.
classification of data :
on the basis of
1. source
2. expression
3.Reliability

Types of data:
On the basis of expression:
1. Categorical data
2. Numerical data
Categorical data:
e.g eye colour (it may be of many categories like black, blue, grey,brown, green)
It is further classified into :
1. Binomial category : present/ absent
2. Multinomial category : e.g hair colour
Numerical data:
It has some numerical value e.g height, age etc
it is further classified into :
1. Discrete data : consist of a whole number
2. Continuous data : expressed in fractions


Types of data:
On the basis of source:
1. Primary data
2. Secondary data
Primary data:
Researcher is involved by himself in collection, generation or recording data.
Secondary data:
Data collected by asking other people ,not gathered by researcher itself


Types of data:
On the basis of Reliability:
1.Biased
2.Unbaised
Biased Data:
There is error probability in such a data.
Unbiased Data:
Less error probabobility. not 100% accurate but free from detectable errors