> For the complete documentation index, see [llms.txt](https://docs.videc.de/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.videc.de/acron-9.3/en/anlagenkonfiguration/verfahrensgroessen/handgroesse/register_verdichtung/tageswerte.md).
# Daily values
Compression level to which the calculation result is compressed by the selected compression method.
## Limit value range from/to\*
Start/end of the limit value range of the daily values
Note
The limit value range must be within the measuring range.
## Unit\*
Unit at this compression level
## Decimal places\*
Number of decimal places to output
* Positive values indicate the number of decimal places to output.
* Negative values specify rounding of the process variable values to tens, hundreds, thousands, etc.
DP = -1
402
1007
is rounded down to
is rounded up to
400
1010
DP = -2
1007
4162
is rounded down to
is rounded up to
1000
4200
DP = -3
2234
3657
is rounded down to
is rounded up to
2000
4000
\*Limit value range, unit and decimal places are [individual settings for each compression level](/acron-9.3/en/anlagenkonfiguration/verfahrensgroessen/autogroesse/register_verdichtung.md#individuell), which can be activated in the process values area.
## Compression method
Note
For process variables with output format in text, only the First value, Last value, Catenate and Catenate without duplicate compression methods are available.
Compression methods indicate the way in which the data are compressed into a process variable, such as when forming the monthly values from the day data.
### - Arithmetic median
The arithmetic average is formed from the single values.
### - Logarithmic median
The logarithmic median compresses average values of logarithmic measurement variables such as pH values. The Base 10 logarithm is used. For process variables with this compression the measuring range should be limited to -100 to +100, as this already corresponds to a regular measuring range of 1E-99 to 1E99.
### - Last value / First value
Only the last or first value of all values is determined for the time frame. Use this compression method where the process variable is a count value and when you want to output the value in ACRON as a meter reading (as opposed to a meter difference).
### - Frequency
In this compression mode the measurement values are searched according to the frequency of their occurrence, and the measurement value which occurred most frequently is carried over into the next stage. This method is used, for example, when analyzing weather charts.
### - Sum
All single values are totalized.
### - Median
The median is the value which exactly 50% of measurement values are below and 50% above. It may differ widely from the average.
The median is formed from the following series of numbers: *1 2 3 8 9*
The result is *3*, because two values are less than it and two greater (the average value produces 4.6).
### - [Percentile value](/acron-9.3/en/acron_der_anlagenchronist/datenverdichtung.md#perzentilwertberechnung) X
The percentile value is the value under which X% of all values fall.
### - Standard deviation – totality / sample
The standard deviation measures the spread of a distribution of values. A distinction is made between:
| | |
| -------------------------------- | -------------------------------- |
| *totality* | *sample* |
|  |  |
### - Last value / First value (auto variable/manual variable with output format as text)
Only the last or first value of all values is determined for the time frame. Use this compression method where the process variable is a count value and when you want to output the value in ACRON as a meter reading (as opposed to a meter difference).
### - Catenating (auto variable/manual variable with output format as text)
The character string of the analysis level (e.g. daily value) is formed by linking the character strings of the lower analysis level (here interval values).
### - Catenating without duplicates (auto variable/manual variable with output format as text)
This method skips character strings that already exist.
10:00-11:00 A
11:00-12:00 A
12:00-13:00 D
13:00-14:00 C
14:00-15:00 A
15:00-16:00 D
16:00-17:00 B
17:00-18:00 B
18:00-19:00 C
19:00-20:00 B
Catenate:
`AADCADBBCB`
Catenating without duplicates:
`ADCB`
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