Timothy G. Gregoire

J. P. Weyerhaeuser, Jr., Professor of Forest Management

Timothy G. Gregoire is on leave.
Spring 2017

 
Publications (BETA)

This is a PARTIAL listing of recent publications, and it will continue to grow as we populate our publications database.

2017

  • Journal Article
    Calegario, N., T. G. Gregoire, T. A. da Silva, M. Tomazello, and J. A. Alves. “. Integrated system of equations for estimating stem volume, density, and biomass for Australian redcedar (Toona ciliata) plantations.” Canadian Journal of Forest Research 47.5 (2017): 681-689. DOI: 10.1139/cjfr-2016-0135
  • Journal Article
    Strimbu, V. F., L. T. Ene, T. Gobakken, T. G. Gregoire, R. Astrup, and E.Næsset. “Post-stratified change estimation for large-area forest biomass using repeated ALS strip sampling.” Canadian Journal of Forest Research 47.6 (2017): 839-847. DOI: 10.1139/cjfr-2017-0031
  • Journal Article
    Bukoski, J. J., J. S. Broadhead, D. C. Donato, D. Murdiyarso, and T. G. Gregoire. “The use of mixed effects models for obtaining low-cost ecosystem carbon stock estimates in mangroves of the Asia-Pacific.” PLoS ONE 12.1 (2017): e0169096. DOI: 10.1371/journal.pone.0169096
  • Journal Article
    Saarela, S., H-E. Andersen, A. Grafström, S. Schnell, T. Gobakken, E. Næsset, R. F. Nelson, R. E. McRoberts, T. G. Gregoire, and G. Ståhl. “A new prediction-based variance estimator for two-stage model-assisted surveys of forest resources.” Remote Sensing of Environment 192 (2017): 1-11. DOI: 10.1016/j.rse.2017.02.001
  • Journal Article - Forthcoming
    Umunay, P. M., K. R. Covey, J.-R. Makana, and T. G. Gregoire. “Effect of light, fire and weed control on establishment of Pericopsis elata Harms regeneration.” New Forests (2017). DOI: 10.1007/s11056-017-9594-4
  • Journal Article - Forthcoming
    Gregoire, T. G. and D. L. R. Affleck. “Estimating desired sample size for simple random sampling of a skewed population.” The American Statistician (2017). DOI: 10.1080/00031305.2017.1290548
  • 2016

  • Journal Article
    Ringvall, A. H., G. Ståhl, L.T. Ene, E. Næsset, T. Gobakken, and T. G. Gregoire. “A poststratified ratio estimator for model-assisted biomass estimation in sample-based airborne laser scanning surveys.” Canadian Journal of Forest Research 46.11 (2016): 1386-1395. DOI: 10.1139/cjfr-2016-0158
  • Journal Article
    Gregoire, T. G., A. H. Ringvall, G. Ståhl and E. Næsset. “Conditioning post-stratified inference following two-stage, equal-probability sampling.” Environmental and Ecological Statistics 23.1 (2016): 141-154. DOI: 10.1007/s10651-015-0332-9
  • Journal Article
    Salas, C., T. G. Gregoire, D. J. Craven, and H. Gilabert. “Modelación del crecimiento de bosques: estado del arte. (Forest growth modeling: the state of the art).” Bosque 37.1 (2016): 3-12. DOI: 10.4067/S0717-92002016000100001
  • Journal Article
    Owais, G., L. A. McKay, T. G. Gregoire, Y. Guan, B. P. Leaderer, and T. R. Holford. “Spatiotemporal calibration and resolution refinement of output from deterministic models.” Statistics in Medicine 35.14 (2016): 2422-2440. DOI: 10.1002/sim.6867
  • Journal Article
    Chhetri, P. B., S. Katwal, T. Dukpa, S. Drukgyel, and T. G. Gregoire. “The Randomized Branch Sampling – A Cost Effective Estimation Method of Above Ground Biomass.” Indian Forester 142.1 (2016): 47-61. Link
  • Journal Article
    Gregoire, T. G., E. Næsset, R. E. McRoberts, G. Ståhl, H.-E. Andersen, T. Gobakken, L. Ene, and R. Nelson. “Statistical rigor in LiDAR-assisted estimation of aboveground forest biomass.” Remote Sensing of Environment 173 (2016): 98-108. DOI: 10.1016/j.rse.2015.11.012
  • Journal Article
    Ståhl, G., S. Saarela, S. Schnell, S. Holm, J. Breidenbach, S. P. Healy, P. L. Patterson, S. Magnussen, E. Næsset, R. McRoberts, and T. G. Gregoire. “Use of models in large-area forest surveys: comparing model-assisted, model-based, and hybrid estimation.” Forest Ecosystems 3 (2016): 5. DOI: 10.1186/s40663-016-0064-9
  • Journal Article
    Saarela, S., S. Holm, A. Grafström, S. Schnell, E. Næsset, T. G. Gregoire, R. F. Nelson, and G. Ståhl. “Hierarchical model-based inference for forest inventory utilizing three sources of information.” Annals of Forest Science 73.4 (2016): 895-910. DOI: 10.1007/s13595-016-0590-1
  • Journal Article
    Ene, L. T., E. Næsset, T. Gobakken, E. W. Mauya, O-M. Ballandsas, T. G. Gregoire, G. Ståhl, and E. Zahabu. “Large-scale estimation of aboveground biomass in miombo woodlands using airborne laser scanning and national forest inventory data.” Remote Sensing of Environment 186 (2016): 626-636. DOI: 10.1016/j.rse.2016.09.006
  • 2015

  • Journal Article
    Affleck, D. L. R., and T. G. Gregoire. “Generalized and synthetic regression estimators for randomized branch sampling.” Forestry 88.5 (2015): 599-611. DOI: 10.1093/forestry/cpv027
  • Journal Article
    Mehtatalo, L., S. de-Miguel, and T. G. Gregoire. “Modeling height-diameter curves for prediction.” Canadian Journal of Forest Research 45.7 (2015): 826-837. DOI: 10.1139/cjfr-2015-0054
  • Journal Article
    Gregoire, T. G. “Nonparallel Regressions with Indicator Variables.” International Journal of Statistics and Probability 4.2 (2015): 46-54. DOI: 10.5539/ijsp.v4n2p46
  • 2014

  • Journal Article
    Goodale, U. M., G. P. Beryln, T. G. Gregoire, K. U. Tennakoon, and M. S. Ashton. “Differences in Survival and Growth Among Tropical Rain Forest Pioneer Tree Seedlings in Relation to Canopy Openness and Herbivory.” Biotropica 46.2 (2014): 183-193. DOI: 10.1111/btp.12088
  • 2013

  • Journal Article
    Bollandsås, O. M., T. G. Gregoire, E. Næsset, and B.-H. Øyen. “Detection of biomass change in a Norwegian mountain forest area using small footprint airborne laser scanner data.” Statistical Methods and Applications 22.1 (2013): 113-129. DOI: 10.1007/s10260-012-0220-5
  • Journal Article
    Browning, M. H. E. M., J. L. Marion, and T. G. Gregoire. “Sustainability connecting children with nature – An exploratory study of nature play area visitor impacts and their management.” Landscape and Urban Planning 119 (2013): 104–112. DOI: 10.1016/j.landurbplan.2013.07.004
  • Journal Article
    Næsset, E., T. Gobakken, O. M. Bollandsås, T G. Gregoire, R. Nelson, and G. Ståhl. “Comparison of precision of biomass estimates in regional field sample surveys and airborne LiDAR-assisted surveys in Hedmark County, Norway.” Remote Sensing of Environment 130 (2013): 108-120. DOI: 10.1016/j.rse.2012.11.010
  • Journal Article
    Ene, L., E. Næsset, T. Gobakken, T. G. Gregoire, G. Ståhl, and R. Nelson. “A simulation approach for accuracy assessment of two-phase post-stratified estimation in large-area LiDAR biomass surveys.” Remote Sensing of Environment 133 (2013): 210-224. DOI: 10.1016/j.rse.2013.02.002
  • Journal Article
    Næsset, E., O. M. Bollandsås, T. Gobakken, T. G. Gregoire, and G. Ståhl. “Model-assisted estimation of change in forest biomass over an 11 year period in a sample survey supported by airborne LiDAR: A case study with poststratification to provide “activity data”.” Remote Sensing of Environment 128 (2013): 299-314. DOI: 10.1016/j.rse.2012.10.008
  • 2012

  • Journal Article
    Fehrmann, L., T. G. Gregoire, and C. Kleinn. “Triangulation based inclusion probabilities: A design-unbiased sampling approach.” Environmental and Ecological Statistics 19.1 (2012): 107-123. DOI: 10.1007/s10651-011-0177-9
  • Journal Article
    Ene, L. T., E. Næsset, T. Gobakken, T. G. Gregoire, G. Ståhl, and R. Nelson. “Assessing the accuracy of regional LIDAR-based biomass estimation using a simulation approach.” Remote Sensing of Environment 123 (2012): 579-592. DOI: 10.1016/j.rse.2012.04.017
  • Journal Article
    Goodale, U. M., M. S. Ashton, G. P. Berlyn, T. G. Gregoire, B. M. P. Singhakumara, and K. U. Tennakoon. “Disturbance and tropical pioneer species: Patterns of association across life history stages.” Forest Ecology and Management 277 (2012): 54-66. DOI: 10.1016/j.foreco.2012.04.020
  • Journal Article
    Gobakken T., E. Næsset, R. Nelson, O. M. Bollandsås, T. G. Gregoire, G. Ståhl, S. Holm, H. O. Ørka, and R. Astrup. “Estimating biomass in Hedmark County, Norway using national forest inventory field plots and airborne laser scanning.” Remote Sensing of Environment 123 (2012): 443-456. DOI: 10.1016/j.rse.2012.01.025
  • Journal Article
    Nelson, R., T. Gobakken, E. Næsset, T. G. Gregoire, G. Ståhl, S. Holm, and J. Flewelling. “Lidar sampling – Using an airborne profiler to estimate forest biomass in Hedmark County, Norway.” Remote Sensing of Environment 123 (2012): 563-578. DOI: 10.1016/j.rse.2011.10.036
  • 2011

  • Journal Article
    Gregoire, T. G. and Z. Li. “An empirical evaluation of the accuracy of the Hartley and Rao (1962) variance approximation following systematic pps sampling.” Pakistan Journal of Statistics 27.4 (2011): 555-566. Link
  • Journal Article
    van Breugel, M., J. S. Hall, D. J. Craven, T. G. Gregoire, A. Park, D. H. Dent, M. Wishnie, E. Mariscal, J. Deago, D. Ibarra, N. Cedeño, and M. S. Ashton. “Early growth and survival of 49 tropical tree species across sites differing in soil fertility and rainfall in Panama.” Forest Ecology and Management 261.10 (2011): 1580-1589. DOI: 10.1016/j.foreco.2010.08.019
  • Journal Article
    Gregoire, T. G., G. Ståhl, E. Næsset, T. Gobakken, R. Nelson, and S. Holm. “Model-assisted estimation of biomass in a LiDAR sample survey in Hedmark County, Norway.” Canadian Journal of Forest Research. 41.1 (2011): 83-95. DOI: 10.1139/X10-195
  • Journal Article
    Ståhl, G., S. Holm, T. G. Gregoire, T. Gobakken, E. Næsset, and R. Nelson. “Model-based Inference for Biomass Estimation in a LiDAR Sample Survey in Hedmark County, Norway.” Canadian Journal of Forest Research. 41.1 (2011): 96-107. DOI: 10.1139/X10-161
  • Journal Article
    Næsset, E., T. Gobakken, S. Solberg, T. G. Gregoire, R. Nelson, G. Ståhl, and D. Weydahl. “Model-assisted regional forest biomass estimation using LiDAR and InSAR as auxiliary data: A case study from a boreal forest area.” Remote Sensing of Environment 115.12 (2011): 3599-3614. DOI: 10.1016/j.rse.2011.08.021
  • 2010

  • Journal Article
    Salas, C. and T. G. Gregoire. “Statistical analysis of ratio estimators and their estimators of variances when the auxiliary variate is measured with error.” European Journal of Forest Research 129.5 (2010): 847-861. DOI: 10.1007/s10342-009-0277-3
  • Journal Article
    Salas, C., L. Ene, T. G. Gregoire, E. Næsset, and T. Gobakken. “Modelling tree diameter from airborne laser scanning derived variables: A comparison of spatial statistical models.” Remote Sensing of Environment 114.6 (2010): 1277-1285. DOI: 10.1016/j.rse.2010.01.020
  • Book
    Pant, P., P. Sharma, S. Jain, and T. G. Gregoire. Analysis of REDD for India: Opportunities and Challenges. Saarbrücken: VDM Verlag R. Muller, 2010. Link
  • 2009

  • Book Chapter
    Brewer, K. R. W. and T. G. Gregoire. “Introduction to survey sampling.” Handbook of Statistics – Vol 29A. Sample Surveys: Design, Methods and Applications. Ed. D. Pfeffermann and C.R. Rao Atlanta: Elsevier B. V., 2009. 9-37. DOI: 10.1016/S0169-7161(08)00001-1
  • Journal Article
    Gregoire, T. G. and C. Salas. “Ratio Estimation with Measurement Error in the Auxiliary Variate.” Biometrics 65.2 (2009): 590-598. DOI: 10.1111/j.1541-0420.2008.01110.x
  • Journal Article
    Valentine, H. T., D. L. R. Affleck, and T. G. Gregoire. “Systematic sampling of discrete and continuous populations: sample selection and the choice of estimator.” Canadian Journal of Forest Research 39.6 (2009): 1061-1068. DOI: 10.1139/x09-019
  • Journal Article
    Goodale, U. M., G. P. Berlyn, T. G. Gregoire, and M. S. Ashton. “Ecological Significance of Crown Functional Traits Across Size Classes and Disturbance Environments in Eight Pioneer Species in a Sri Lankan Rain Forest.” Journal of Sustainable Forestry 28.1-2 (2009): 22-47. DOI: 10.1080/10549810802626126
  • Journal Article
    Nelson, R., J. Boudreau, T. G. Gregoire, H. Margolis, E. Næsset, T. Gobakken, and G. Ståhl. “Estimating Quebec provincial forest resources using ICESat/GLAS.” Canadian Journal of Forest Research 39.4 (2009): 862-881. DOI: 10.1139/x09-002
  • 2008

  • Book Chapter
    Valentine, H. T., J. H. Gove, M. J. Ducey, T. G. Gregoire, and M. S. Williams. “Estimating the Carbon in Coarse Woody Debris with Perpendicular Distance Sampling.” Field Measurements for Forest Carbon Monitoring: A Landscape-scale Approach. Ed. C. M. Hoover New York City: Springer Netherlands, 2008. 73-87. DOI: 10.1007/978-1-4020-8506-2_6
  • Journal Article
    Gregoire, T. G., Q. F. Lin, J. Boudreau, and R. Nelson. “Regression Estimation Following the Square-Root Transformation of the Response.” Forest Science 54.6 (2008): 597-606. Link
  • Journal Article
    Mehtätalo, L., T. G. Gregoire, and H. Burkhart. “Comparing Strategies for Modeling Tree Diameter Percentiles from Remeasured Plots.” Environmetrics 19.5 (2008): 529-548. DOI: 10.1002/env.896
  • Journal Article
    Nelson, R.F, E. Næsset, T. Gobakken, G. Ståhl, and T. G. Gregoire. “Regional Forest Inventory Using an Airborne Profiling LiDAR.” Japanese Journal of Forest Planning 13 (2008): 287-294. Link
  • 2007

  • Journal Article
    Evans, A. M. and T. G. Gregoire. “A geographically variable model of hemlock woolly adelgid spread.” Biological Invasions 9.4 (2007): 369-382. DOI: 10.1007/s10530-006-9039-z
  • Book
    Gregoire, T. G. and H. T. Valentine. Sampling Strategies for Natural Resources and the Environment. Boca Raton: Chapman and Hall/CRC, 2007. Link
  • Journal Article
    Evans, A. M. and T. G. Gregoire. “The tree crown distribution of hemlock woolly adelgid, Adelges tsugae (Homoptera:Adelgidae) from randomized branch sampling.” Journal of Applied Entomology 131.1 (2007): 26-33. DOI: 10.1111/j.1439-0418.2006.01121.x