| Term No. | Term Name/Term Description | Action |
|---|
| 6 |
| Accuracy of the mean | | The closeness of agreement between the true value and the mean result obtained by applying the experimental procedure to a very large number of times. The smaller the systematic part of the experimental errors which affect the results, the more accurate is the procedure...... | | Similar Terms |
| 67 |
| Frequency curve | | The graphical representation of the frequency of occurrence of specific events, or a continuous frequency distribution, the variate being the abscissa and the frequency the ordinate...... | | Similar Terms |
| 68 |
| Similar Terms |
| 69 |
| Cumulative frequency function curve | | Cumulative frequencies divided by the total number of observations, gives the relative cumulative frequency distribution and its plotting against the class interval concerned gives the cumulative frequency function curve...... | | Similar Terms |
| 72 |
| Lorenz curve | | The degree of inequality in a distribution series is sometimes depicted by a Lorenz curve. The percentage cumulative observations are plotted against the percentage cumulative frequencies. In addition, a diagonal is drawn from the origin to the point of 100 per cent frequency - 100 per cent observations to represent the extreme condition of a compl..... | | Similar Terms |
| 74 |
| Duration curve | | A curve that expresses the relation of all the units of some item (e.g. flow), arranged in order of magnitude as the ordinate, and time (frequently expressed in percentage) as the abscissa; a graphical representation of the number of times given quantities are equalled or exceeded during a certain period of record. The duration curve is the integra..... | | Similar Terms |
| 75 |
| Duration-area curve of flows | | A curve that shows the area beneath a duration curve and value of the flow, and is, thus an integral of duration with respect to stream flow. When the duration curve is plotted as a percentage of time, the resulting duration area shows the average flow available below a given discharge...... | | Similar Terms |
| 76 |
| Envelope curve | | A smooth curve covering either all peak values or all trough values of certain quantities (e.g. rainfall, runoff), plotted against other factors, such as area, time. In general, none of the peak values go above the curve in the former case, called the `maximum envelope curve`, and when none of the minimum points falls below the curve is called the ..... | | Similar Terms |
| 77 |
| Similar Terms |
| 78 |
| Probability curve | | A curve that expresses the relation of the cumulative frequency of occurrence of a given event, based on an extended record of past occurrences. The curve is usually plotted with specially prepared coordinate paper, with ordinates representing magnitude equal to or less than the event, and abscissa representing probability, time or other units of i..... | | Similar Terms |
| 79 |
| Mass diagram, Mass curve, Flow integrated curve, or Summation curve | | A diagram, curve, or graph, plotted with rectangular coordinates, representing a summation (integration) of all preceding quantities up to a point. Each ordinate being equal to the sum of preceding terms in the series, with the corresponding abscissa representing elapsed time, etc. The diagram is used extensively in storage and regulation studies p..... | | Similar Terms |
| 80 |
| Residual mass diagram or Residual mass curve | | A diagram or graph plotted with rectangular coordinates, each ordinate being equal to (i) the summation of all preceding quantities up to a given point, minus (ii) the arithmetical mean of the series times the number of quantities in the series up to the given point, with the corresponding abscissa representing time, number of the item in the serie..... | | Similar Terms |
| 82 |
| Curve fitting | | 1 - The fitting of a mathematical curve to any statistical data, e.g. regression data or time series. 2 - The fitting of a mathematically specified frequency curve to a frequency distribution observed...... | | Similar Terms |
| 105 |
| Arithematic mean | | The arithmetic mean of a set of values. Generally denoted by a bar, thus : | | Similar Terms |
| 107 |
| Similar Terms |
| 109 |
| Geometric mean | | If the set of n values are all multiplied together and the nth root is taken, the results are known as the geometric mean (G), viz. G = (x1 . x2 ... x n-1 . xn)1/n ..... | | Similar Terms |
| 110 |
| Harmonic mean | | The reciprocal of the arithmetic mean of the reciprocals of each observation. | | Similar Terms |
| 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..... | | Similar Terms |
| 114 |
| Root mean square | | The square root of the arithmetic mean of the squares of each observation and is given by | | Similar Terms |
| 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...... | | Similar Terms |
| 129 |
| Mean square | | In general, the mean square of a set of values is the arithmetic mean of the squares of their differences from some given value, namely their second moment about that value...... | | Similar Terms |
| 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...... | | Similar Terms |
| 188 |
| Operating-characteristic curve, or OC curve | | A curve relating the probability of the same decision (i.e. in the acceptance of an incorrect null hypothesis) to various alternative values of the parameter is called the `operating-characteristic curve`, usually abbreviated to `OC curve`. The OC curve shows how the test or decision procedure operates, regardless of whether that operation is corre..... | | Similar Terms |
| 208 |
| Mean square error of estimate | | The square root of the arithmetic mean of the squared deviations between the estimates for different samples and the population parameter under estimation...... | | Similar Terms |
| 222 |
| Operating characteristic in quality control, or OC curve in quality control | | A curve showing the probability that a lot (or process) level of a quality would be accepted (or said to be in control), assuming the specified sampling plan is in use, plotted against the possible lot or process qualities. This curve is completely analogous to the operating-characteristic curve (or OC curve) for deciding on null hypothesis (See 18..... | | Similar Terms |
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