Basic Statistics using R
Basic Statistical operations such as :
1. Measures of central tendency :
which tells about where centre of data is lying
1. Mean:
Mean or average = (sum of elements/Total number of elements)
2. Median:
Median is the middle most value
3. Mode:
It is most Frequent Value
2. Measures of Dispersion:
Dispersion from the mean
1.Variance:
The measure of variance from the mean
2.Standard Deviation:
Variance has sq units which is unacceptable practically so we go for standard deviation (sqrt(variance))
3.Range:
Range=Max-Min
3. Skewness:
Measure of symmetry in distribution
Skewness=0 or nearly 0 for normal distribution
4. Kurtosis:
Measure of Peakness of Diastribution
5. Normal Distribution:
Symmetrical arount mean.
Area under curve is 100%
Mean=0 and standard deviation=1 or constant
6. Z-score:
To standardize the normal distribution we use this.
Range is [-3,3]
7. T-score:
To standardise the normal distribution when we dont have standard deviation
8 Visualizations:
To understand data, we use visualizations
9 Confidence Interval:
The interval in which we have confidence that our value is present
Data used:
Q7,Q9_a,Cars
Programming :
R - Language
The Codes regarding Basic Statistical operations and their datasets are present in this Repository in detail