Derived timeseries data¶
- class pyam.compute.IamComputeAccessor(df)[source]¶
Perform computations on the timeseries data of an IamDataFrame
An
IamDataFrame
has a module for computation of (advanced) indicators from the timeseries data.The methods in this module can be accessed via
IamDataFrame.compute.<method>(*args, **kwargs)
Methods
bias
(name, method, axis)Compute the bias weights and add to 'meta'
growth_rate
(mapping[, append])Compute the annualized growth rate of a timeseries along the time dimension
learning_rate
(name, performance, experience)Compute the implicit learning rate from timeseries data
quantiles
(quantiles[, weights, level, append])Compute the optionally weighted quantiles of data grouped by level.
- bias(name, method, axis)[source]¶
Compute the bias weights and add to ‘meta’
- Parameters:
- namestr
Column name in the ‘meta’ dataframe
- methodstr
Method to compute the bias weights, see the notes
- axisstr
Index dimensions on which to apply the method
Notes
The following methods are implemented:
“count”: use the inverse of the number of scenarios grouped by axis names.
Using the following method on an IamDataFrame with three scenarios
df.compute.bias(name="bias-weight", method="count", axis="scenario")
results in the following column to be added to df.meta:
model
scenario
bias-weight
model_a
scen_a
0.5
model_a
scen_b
1
model_b
scen_a
0.5
- growth_rate(mapping, append=False)[source]¶
Compute the annualized growth rate of a timeseries along the time dimension
The growth rate parameter in period t is computed based on the changes to the subsequent period, i.e., from period t to period t+1.
- Parameters:
- mappingdict
Mapping of variable item(s) to the name(s) of the computed data, e.g.,
{"variable": "name of growth-rate variable", ...}
- appendbool, optional
Whether to append computed timeseries data to this instance.
- Returns:
IamDataFrame
or NoneComputed timeseries data or None if append=True.
- Raises:
- ValueError
Math domain error when timeseries crosses 0.
See also
- learning_rate(name, performance, experience, append=False)[source]¶
Compute the implicit learning rate from timeseries data
Experience curves are based on the concept that a technology’s performance improves as experience with this technology grows.
The “learning rate” indicates the performance improvement (e.g., cost reduction) for each doubling of the accumulated experience (e.g., cumulative capacity).
The experience curve parameter b is equivalent to the (linear) slope when plotting performance and experience timeseries on double-logarithmic scales. The learning rate can be computed from the experience curve parameter as \(1 - 2^{b}\).
The learning rate parameter in period t is computed based on the changes to the subsequent period, i.e., from period t to period t+1.
- Parameters:
- namestr
Variable name of the computed timeseries data.
- performancestr
Variable of the “performance” timeseries (e.g., specific investment costs).
- experiencestr
Variable of the “experience” timeseries (e.g., installed capacity).
- appendbool, optional
Whether to append computed timeseries data to this instance.
- Returns:
IamDataFrame
or NoneComputed timeseries data or None if append=True.
- quantiles(quantiles, weights=None, level=['model', 'scenario'], append=False)[source]¶
Compute the optionally weighted quantiles of data grouped by level.
For example, the following will provide the interquartile range and median value of CO2 emissions across all models and scenarios in a given dataset:
df.filter(variable='Emissions|CO2').compute.quantiles([0.25, 0.5, 0.75])
- Parameters:
- quantilescollection
Group of quantile values to compute
- weightspd.Series, optional
Series indexed by level
- levelcollection, optional
The index columns to compute quantiles over
- appendbool, optional
Whether to append computed timeseries data to this instance.
- Returns:
IamDataFrame
or NoneComputed data or None if append=True.
- Raises:
- ValueError
If more than one variable provided or if argument weights is malformed.