def correlate_redshift_emission_line(quasars, line, subset=False):
""" Plot correlation between redshift and emission line strength.
Provide Spearman's rho, pearson's R and linear regression. """
# Get datapoints for which the redshift and line luminosity is known.
# The error array of the redshift will be empty.
REDSHIFT, REDSHIFT_ERR, LINE, LINE_ERR\
= find_intersection(quasars, 'REDSHIFT', line)
if subset:
REDSHIFT_range = []
LINE_range = []
for i in xrange(len(REDSHIFT)):
if REDSHIFT[i] > 1.5 and REDSHIFT[i] < 2.2:
REDSHIFT_range.append(REDSHIFT[i])
LINE_range.append(LINE[i])
REDSHIFT = REDSHIFT_range
LINE = LINE_range
# Then look at the correlation coefficients and plot the linear regression
print
print "Spearman's Rho\nSelf-written method:\t{0}\nScipy method:\t\t{1}"\
.format(spearmanr_sarah(REDSHIFT, LINE),
scipy.stats.spearmanr(REDSHIFT, LINE)[0]),
print
print "Spearman's r\nSelf-written method:\t{0}\nScipy method:\t\t{1}"\
.format(pearsonr_sarah(REDSHIFT, LINE),
scipy.stats.pearsonr(REDSHIFT, LINE)[0])
print
print "Linear regression\nSarah: {0}\nGeert{1}"\
.format(linear_regression(REDSHIFT, LINE), "Not implemented")
def test_find_intersection_no_common(self):
lst1 = LinkedList()
lst2 = LinkedList()
lst1.insert(4)
lst1.insert(3)
lst1.insert(2)
lst1.insert(1)
lst2.insert(4)
lst2.insert(3)
lst2.insert(2)
lst = find_intersection(lst1, lst2)
self.assertEqual(lst, None)
def main():
""" Parse and clean dataset, then do statistics """
quasars = parse_dataset('sdss_dr7_qsos.dat')
print 'Example usage'
quasars = parse_dataset('sdss_dr7_qsos.dat')
for quasar in [quasars[1], quasars[1337], quasars[13370]]:
si = quasar.to_si_for_Sarah() # nieuwe quasar
print quasar.RA, "=>", si.RA
print quasar.DEC, "=>", si.DEC
print '\n\n'
attr1_list, attr1_err_list, attr2_list, attr2_err_list =\
find_intersection(quasars, 'LOGL1350', 'LOGL5100')
attr1_list, attr1_err_list, attr2_list, attr2_err_list,\
attr3_list, attr3_err_list =\
find_intersection(quasars, 'LOGL3000', 'LOGL5100', 'LOGBH')
attr1_list, attr1_err_list, attr2_list, attr2_err_list,\
attr3_list, attr3_err_list, attr4_list, attr4_err_list =\
find_intersection(quasars, 'LOGL3000', 'LOGL5100', 'LOGBH', 'LOGLBOL')
def test_find_intersection(self):
lst = find_intersection(self.lst1, self.lst2)
self.assertEqual(lst.size(), 4)
self.assertEqual(lst.head.get_data(), 7)
self.assertEqual(lst.head.get_next().get_data(), 5)