File:Ohio temps qq.svg
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Original file (SVG file, nominally 360 × 315 pixels, file size: 27 KB)
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Summary
| Description |
English: A quantile-quantile plot comparing the distributions of daily maximum temperature in the U.S. state of Ohio in March and in July. |
| Date | |
| Source | Own work |
| Author | Skbkekas |
| SVG development |  This plot was created with Matplotlib. |
| Source code | Python code## "state33" data file obtained from: ftp://ftp.ncdc.noaa.gov/pub/data/ushcn/daily/README
import gzip
import numpy as np
import matplotlib.pyplot as plt
fid = gzip.open("state33.gz")
month1 = 3
month2 = 7
M1,M2 = [],[]
for line in fid:
stid = int(line[0:7])
if line[7:11]=="TMAX":
mo = int(line[17:19])
nday = int(line[20:22])
if mo not in [month1,month2]: continue
V,ii = [],26
for k in range(nday):
V.append(float(line[ii:ii+2]))
ii += 8
if mo==month1: M1.extend(V)
if mo==month2: M2.extend(V)
M1 = np.array(np.sort(M1))
M2 = np.array(np.sort(M2))
M1 = M1[M1!=99]
M2 = M2[M2!=99]
M1 = (M1-M1.mean())/M1.std()
M2 = (M2-M2.mean())/M2.std()
Q1 = [M1[int(q*len(M1))] for q in np.arange(1,1000,dtype=np.float64)/1000]
Q2 = [M2[int(q*len(M2))] for q in np.arange(1,1000,dtype=np.float64)/1000]
P1 = [M1[int(q*len(M1))] for q in np.arange(1,10,dtype=np.float64)/10]
P2 = [M2[int(q*len(M2))] for q in np.arange(1,10,dtype=np.float64)/10]
plt.clf()
plt.figure(figsize=(4,3.5))
plt.axes([0.15,0.15,0.8,0.8])
plt.grid(True)
plt.plot(Q1, Q2, '-', color="gray", lw=3)
plt.hold(True)
plt.plot([-3,3], [-3,3], '-', color='black')
plt.plot(P1, P2, 'o', mec='black', mfc='red')
plt.xlim(-2,3)
plt.ylim(-2,3)
plt.xlabel("March", size=14)
plt.ylabel("July", size=14)
plt.savefig("ohio_temps_qq.pdf")
plt.savefig("ohio_temps_qq.svg")
|
Licensing
I, the copyright holder of this work, hereby publish it under the following license:
This file is licensed under the Creative Commons Attribution 3.0 Unported license.
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 14:52, 13 November 2009 | | 360 × 315 (27 KB) | Skbkekas | {{Information |Description={{en|1=A quantile-quantile plot comparing the distributions of daily maximum temperature in the U.S. state of Ohio in March and in July.}} |Source={{own}} |Author=Skbkekas |Date=2009-11-13 |Permission= |other_v |
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