Table 1: Some features of atmospheric annual precipitable water of Iran during the three periods of upper-air reanalyzed data retrieved from NCEP/NCAR. (Q means Quartile).
| Distributions |
Statistical Specifications |
1948-1957 |
1958-1978 |
1979-2012 |
| Central index |
mean |
15.02 |
14.6 |
13.03 |
| mode |
8.41 |
7.7 |
7.2 |
| – |
|
Dispersion index |
range |
14.7 |
| 15.2 |
14.2 |
Variance |
15.03 |
| 14.06 |
14.4 |
Std |
3.87 |
| 3.75 |
3.79 |
Coefficient variation |
25.5 |
| 26.4 |
9.7 |
distribution index |
skewness |
0.123 |
| 0.124 |
0.184 |
Kurtosis |
-0.837 |
| -0.625 |
-0.647 |
|
|
|
| Thresholds |
Q1 |
11.5 |
11.4 |
| 10.5 |
Q2 |
14.6 |
14.3 |
| 13.6 |
Q3 |
17.9 |
16.6 |
| 15.9 |
Maximum |
23.1 |
22.9 |