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Comparison · Infra & APIs
vimp vs volcalc
A side-by-side editorial comparison of vimp and volcalc — release velocity, themes, recent moves, and the top alternatives to consider.
vimp vs volcalc: at a glance
What is vimp?
Algorithm-agnostic variable importance, settled since 2022 and now answering CRAN checks
vimp performs inference on variable importance measures that do not depend on the fitting algorithm, using sample-splitting so tests stay valid under the zero-importance null. The statistical design settled in 2022: predictiveness measures gained their own S3 class, point estimation was decoupled from inference through the final_point_estimate argument, and method and family moved to the outer functions so binary outcomes work. The two 2025 releases are a CRAN documentation fix and an edge-case correction for cutoff-based measures when every prediction is the same value.
What is volcalc?
Rebuilt itself around SMILES and .mol input, then made the chemistry configurable
volcalc estimates the volatility of chemical compounds from their structure, implementing the SIMPOL.1 group-contribution method and the Meredith et al. variant. Version 2.0.0 severed the package from KEGG: calc_vol() takes .mol file paths or SMILES strings directly, is vectorized over multiple compounds, and the group-contribution maths was split into its own simpol1() function. Work since has been chemistry accuracy and configurability — the full set of SIMPOL.1 functional groups, volatility thresholds for clean atmosphere, polluted atmosphere or soil, user-supplied temperature, and a validate option returning NA when structure parsing looks suspect.
vimp vs volcalc: editorial side-by-side
vimp
0.0INFRA · APIS
Algorithm-agnostic variable importance, settled since 2022 and now answering CRAN checks
◆ Current state
vimp performs inference on variable importance measures that do not depend on the fitting algorithm, using sample-splitting so tests stay valid under the zero-importance null. The statistical design settled in 2022: predictiveness measures gained their own S3 class, point estimation was decoupled from inference through the final_point_estimate argument, and method and family moved to the outer functions so binary outcomes work. The two 2025 releases are a CRAN documentation fix and an edge-case correction for cutoff-based measures when every prediction is the same value.
◆ Where it's heading
Substantive development ended in 2022, followed by one narrow addition — a cluster bootstrap for correlated data in 2023 — and two housekeeping releases. What remains visible are careful decisions about the boundary between estimation and inference, including the warning that a Wald interval will not be centred on the point estimate when the full-data or averaged option is used. The maintainer is keeping the package correct and installable rather than extending it.
◆ Prediction
Expect maintenance releases keyed to CRAN check changes; new predictiveness measures are the plausible extension, since the S3 class added in 2.3.0 was introduced specifically to make adding them simpler.
volcalc
0.0INFRA · APIS
Rebuilt itself around SMILES and .mol input, then made the chemistry configurable
◆ Current state
volcalc estimates the volatility of chemical compounds from their structure, implementing the SIMPOL.1 group-contribution method and the Meredith et al. variant. Version 2.0.0 severed the package from KEGG: calc_vol() takes .mol file paths or SMILES strings directly, is vectorized over multiple compounds, and the group-contribution maths was split into its own simpol1() function. Work since has been chemistry accuracy and configurability — the full set of SIMPOL.1 functional groups, volatility thresholds for clean atmosphere, polluted atmosphere or soil, user-supplied temperature, and a validate option returning NA when structure parsing looks suspect.
◆ Where it's heading
The arc runs from a script tied to one database toward a general structure-to-volatility tool. Dropping KEGG from the core in 2.0.0, then removing KEGGREST as a dependency entirely in 2.2.0, took the package from volatility for KEGG compounds to volatility for any structure a user can supply. The accompanying manuscript published in 2023, and the changelog since has been careful about coefficient double-counting — amines and amides have each been corrected — which suggests the group definitions are the part under active scrutiny.
◆ Prediction
The smarts_simpol1 dataset added in 2.2.0 documents how functional groups are defined, pointing toward further estimation methods alongside SIMPOL.1 and Meredith; splitting simpol1() out in 2.0.0 was stated to be groundwork for exactly that.
Alternatives to vimp and volcalc
Other Infra & APIs products tracked by Sparkpulse, ranked by recent ship velocity. Each card links to a full editorial trajectory and lets you pivot into a head-to-head comparison with either vimp or volcalc.
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Okta
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See all vimp alternatives → · See all volcalc alternatives →
Recent activity from vimp and volcalc
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 11mo agovimpUpdate PPV, NPV, Sensitivity, Specificity
- 1y agovimpFix documentation NOTEs
- 1y agovolcalcParsing validation, user-supplied temperature, KEGGREST dropped
- 2y agovolcalcAuthorship and citation updates
- 2y agovolcalcSMILES input, environment-specific thresholds, missing functional groups
- 2y agovolcalcRebuilt around .mol and SMILES input; SIMPOL.1 split into simpol1() ⚡
- 2y agovimpAdd cluster bootstrap
- 3y agovolcalcAmines group removed to stop double-counting with primary amines
- 3y agovolcalcbug fix: standard temperature
- 3y agovimpEnhanced VIM point estimation
- 3y agovimpS3 class for predictiveness measures
- 4y agovimpSpecify 'method' and 'family' in outer functions
Frequently asked questions
What is the difference between vimp and volcalc?
They serve adjacent needs but don't currently overlap on shipped themes. vimp and volcalc are shipping at a similar cadence (velocity 0.0 vs 0.0, both within Sparkpulse's "active" band). See the at-a-glance table above for a side-by-side breakdown of velocity, recent sparks, and editorial themes.
Is vimp better than volcalc?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. vimp and volcalc are shipping at a similar cadence (velocity 0.0 vs 0.0, both within Sparkpulse's "active" band). For your specific use case, the alternatives sections above list other Infra & APIs products to evaluate alongside.
What are the best alternatives to vimp?
Top vimp alternatives in Infra & APIs are ranked by recent ship velocity. Browse the "vimp alternatives" section above for the current picks, or visit /alternatives/vimp for the full list with editorial commentary on each.
What are the best alternatives to volcalc?
Top volcalc alternatives in Infra & APIs are ranked by recent ship velocity. Browse the "volcalc alternatives" section above for the current picks, or visit /alternatives/volcalc for the full list with editorial commentary on each.