model based on an opensource astronomical dataset
astroml+astropy, jupyter, numpy, matplotlib, scipy ... (the list is not full still)
the model uses SDSS quasars dataset, which includes right ascension, declination, redshift, the magnitude and its error(u+g+r+i+z, 2MASS J+H+K) and spectral object identifier of the quasar
dataset: https://classic.sdss.org/dr7/products/value_added/qsocat_dr7.php
first of all i wanted to take a look at the info about data: type, size and etc.
as we see:
- there's 105783 rows and 21 columns, each corresponding to one feature of the quasar
- 80.95% of the features have the float32 type, 9.52% have the float64 type, 4.76% have the int64 type and another 4.76% have the object type
- there are no missing values, all columns have 105783 non-empty values
now let's look at the distribution of features (how many unique values there are in each feature):
tabular data analyses based on all of the info:
| Variable name | Type | Role | Description | Values |
|---|---|---|---|---|
| sdssID | Categorical | Identifier | The identifier of the quasar in the SDSS | Strings of length 14 |
| RA | Numerical | Feature | The right ascension of the quasar in degrees | 0.027228-359.997675 |
| dec | Numerical | Feature | The declination of the quasar in degrees | -17.520442-84.431413 |
| redshift | Numerical | Feature | The redshift of the quasar | 0.064500-5.460800 |
| mag_u & err_u | Numerical | Feature | The magnitude and its error, measured in the u (ultraviolet) filter of the SDSS | 0.000000-26.778999 |
| mag_g & err_g | Numerical | Feature | The magnitude and its error, measured in the g (green) filter of the SDSS | 0.000000-26.420000 |
| mag_r & err_r | Numerical | Feature | The magnitude and its error, measured in the r (red) filter of the SDSS | 0.000000-22.879000 |
| mag_i & err_i | Numerical | Feature | The magnitude and its error, measured in the i (infrared) filter of the SDSS | 0.000000-17.465000 |
| mag_z & err_z | Numerical | Feature | The magnitude and its error, measured in the z (long-wavelength region) filter of the SDSS | 0.000000-8.373411e+17 |
| mag_J & err_J | Numerical | Feature | The magnitude and its error, measured in the J (infrared) filter of the 2MASS system | 0.000000-18.802000 |
| mag_H & err_H | Numerical | Feature | The magnitude and its error, measured in the H (infrared) filter of the 2MASS system | 0.000000-17.886999 |
| mag_K & err_K | Numerical | Feature | The magnitude and its error, measured in the K (infrared) filter of the 2MASS system | 0.000000-17.465000 |
| specobjid | Categorical | Identifier | The spectral object identifier in the SDSS database | 7.509409e+16-8.373411e+17 |
