International Commission on Irrigation & Drainage Commission Interationale des Irrigation et du Drainage

Multilingual Technical Dictionary (MTD)
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Term No.Term Name/Term DescriptionAction
16
Primary sample
A sample taken from a population during the preliminary stage of multistage sampling.
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23
Average error
The mean of all the errors taken without regard to sign.
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33
Sample size
The expanse of sampling units which are to be included in the sample.
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36
Law of large numbers
The larger the samples, the less will be the variability in the sample averages and probability of occurrences. The law of large numbers works by its swamping effect rather than by compensation. By the law of large numbers, the average of a large number of independent measurements will be more precise and, therefore, have more reliability than a si.....
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38
Index number
A statistical indicator for reflecting the changes in magnitude of items in a series or groups of data, in terms of the value of a part of the respective data selected as a base......
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44
Sample
1 - A part of a population, or a subset from a set of units, that is provided by some process, usually a deliberate selection with the object of investigating the properties of the parent population or set. 2 - The data or the observations numbers that have been observed......
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106
Average sample number
The average number of sample units inspected per lot in reaching a decision to accept or reject. It is dependent on the actual quality level of the lot in question......
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107
Consecutive average, Moving average, or Consecutive mean
The mean of a small group of consecutive values, especially annual means, assigned to the middle time-term of the group in the process of smoothing, e.g. 5-year mean......
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113
Weighted average, or Weighted mean
An average of quantities that attaches a series of weights to it in order to make proper allowance for their relative importance. A value obtained by multiplying each of a series of values by its assigned weight and dividing the sum of those products by the sum of the weights. For example, a weighted arithmetic mean of x1, x2 ... xn with weights w1.....
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117
Average deviation, or Mean deviation
A measure of dispersion derived from the average deviation of observations from some central value, such deviations being absolute, i.e. without reference to algebric sign......
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134
Standardized averages, or Standardized means
A method of allowing or `adjusting` the effects of other variables, or for differences in the composition of the groups that are to be compared, by using a standard set of weights to combine the means of sub-groups into a single mean. Used mainly for the construction of index numbers......
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223
Acceptance number
The maximum number of defective items allowable for acceptance. The location of the operating-characteristic curve is determined by the magnitude of the acceptance number......
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267
Semi-average fit
When a straight line trend appears to fit the data well, the data may be divided into two equal parts and arithmetic means calculated for the first and second half, plotted and joined by a straight line which gives the `semi-average fit`. It is more objective than the freehand method, but because of its reliance on arithmetic means, it can be undul.....
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268
Moving average method of fit
The averaging at the central year of a series of overlapping means to smooth out, or damp down, undue high and low, short-term values. Hence, the `moving average fit`. (See also 279)......
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279
Moving average
If a time series is x1,x2,...xn , and these are chosen set of weight
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447
Reynold number
img:equations//446_451_e.jpg
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448
Froude number
img:equations//446_451_e.jpg
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449
Euler number
img:equations//446_451_e.jpg
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450
Weber number
img:equations//446_451_e.jpg
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451
Mach number
img:equations//446_451_e.jpg
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824
Snow sample
A core taken from a snow mantle by means of a snow sampler, from which the depth and density and equivalent water content may be determined......
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825
Snow sampler
An apparatus for measuring snow depth and density.
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1101
Average velocity (of groundwater)
The volume of groundwater passing through a unit cross-sectional area in unit time divided by the porosity of the water transmitting material......
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1199
Mean depth, or Average depth
The cross-sectional area of a stream channel or conduit divided by the surface width.
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1212
Mean velocity, Average velocity, Overall mean velocity
The velocity at a given section or reach of a stream obtained by dividing the discharge of the stream by the cross-sectional area at that section. .....
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