Data analysis-iris data set
Iris data set
The Iris iris data set contains 3 categories, namely Iris-setosa, Iris-versicolor and Iris-virginica, with a total of 150 records, each with 50 data. Each record has 4 characteristics: calyx length, calyx width, petal length, petal width.
- sepallength: sepal length
- sepalwidth: sepal width
- petallength: petal length
- petalwidth: petal width
The units of the above four characteristics are all centimeters (cm)
1. How to import data sets with numbers and texts.
2. Find the average, median and standard deviation of the sepal length of Iris plants.
3. Create a standardized form of the sepal length of Iris plants whose value is exactly between 0 and 1, so that the minimum value is 0 and the maximum value is 1.
4. Find the 5th and 95th percentiles of the sepal length of Iris plants.
5. Modify 20 random positions in the iris_data data set to np.nan values.
6. Find the number and position of missing values in sepallength of iris_data.
7. Filter iris_data rows with sepallength (column 1) <5.0 and petallength (column 3)> 1.5.
8. Select the iris_data row without any nan value.
9. Calculate the correlation coefficient between sepalLength (column 1) and petalLength (column 3) in iris_data.
10. Find out if there are any missing values in iris_data.
11. Replace all occurrences of nan with 0 in the numpy array.
12. Find the unique value and the number of unique values in the iris species.
13. Display the petal length of iris_data (column 3) in the form of a categorical variable. Definition: Less than 3 -->‘small’; 3-5 --> ‘medium’;’>=5 --> ‘large’.
14. Create a new column in iris_data, where volume is(pi x petallength x sepallength ^ 2）/ 3 。
15. Randomly select the species of Iris plants so that the number of Iris-setosa is twice the number of Iris-versicolor and Iris-virginica.
16. Sort the data set according to the sepallength column.
17. Find the most common petal length value in the iris data set.
18. Find the position where the value of the first occurrence is greater than 1.0 in the petalwidth (column 4) of the iris data set.
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