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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
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This plot was created with Matplotlib.
Source code
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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:
w:en:Creative Commons
attribution
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.

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13 November 2009

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Date/TimeThumbnailDimensionsUserComment
current14:52, 13 November 2009Thumbnail for version as of 14:52, 13 November 2009360 × 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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