﻿ FrequencyTableOL(String,Series,Double[]) Method
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 dotnetCHARTING Namespace > StatisticalEngine Class > FrequencyTableOL Method : FrequencyTableOL(String,Series,Double[]) Method

seriesName
The name of the series which will be displayed on the chart, i.e. its label.
s
A statistical series.
boundaries
A strictly increasing sequence of boundaries of the intervals over the real line in which the data sets point will be assigned.
Calculates the frequency table with respect to the open left boundary convention for YValues of the series.

# Syntax

Visual Basic (Declaration)
```Public Overloads Shared Function FrequencyTableOL( _
ByVal seriesName As String, _
ByVal s As Series, _
ByVal boundaries() As Double _
) As Series```
Visual Basic (Usage)Copy Code
``````Dim seriesName As String
Dim s As Series
Dim boundaries() As Double
Dim value As Series

value = StatisticalEngine.FrequencyTableOL(seriesName, s, boundaries)``````
C#
```public static Series FrequencyTableOL(
string seriesName,
Series s,
double[] boundaries
)```

#### Parameters

seriesName
The name of the series which will be displayed on the chart, i.e. its label.
s
A statistical series.
boundaries
A strictly increasing sequence of boundaries of the intervals over the real line in which the data sets point will be assigned.

# Remarks

Say for example the boundary points used are `{b_1, b_2, ..., b_n}`, now the first term of the array returned which represents the frequency table, is the number of elements from the data set within the interval `(-infinity, b_1)`, the second term of the array returned is the number of elements from the data set within the interval `[b_1, b_2)`, and so on...

#### Example

Consider the set of boundaries `{ 1, 2, 3, 4, 5 }`, which divide the real line into six sub-intervals. Now if we use the open left boundary convention then the real line will be divided into the sub-intervals:

(-infinity, 1], (1,2], (2,3], (3,4], (4,5], (5, infinity)

Note that, each point on the real line can be assigned to one of these sub-intervals and therefore when assigning a data point to one of these intervals there will only be one sub-interval in which it belongs.

Therefore, if we consider the data set `{ 0.5, 1.4, 1.3, 2.0, 2.3, 4.5, 5.5}`, if the assign this data set in accordance with the above the conventions then we will have: using Open Left Boundary (OLB) convention:

• Within the interval `(-infinity, 1]`, we assign the data element `0.5`; and hence the frequency of this interval is `1`.
• Within the interval `(1, 2]`, we assign the data element `1.4, 1.3, 2.0`; and hence the frequency of this interval (wrt OLB convention) is `3`.
• Within the interval `(2, 3]`, we assign the data element `2.3`, and hence the frequency of this interval (wrt OLB convention) is `1`.
• Within the interval `(3, 4]`, we assign no data elements, and hence the frequency of this interval (wrt OLB convention) is `0`.
• Within the interval `(4, 5]`, we assign the data element `4.5`, and hence the frequency of this interval (wrt OLB convention) is `1`.
• Within the interval `(5, infinity)`, we assign the data element `5.5`, and hence the frequency of this interval (wrt OLB convention) is `1`.

Hence, in this case the series returned corresponding to the frequency table will be `{1, 3, 1, 0, 1, 1}`.