Fagprofil

Njål Foldnes

Professor - Campus Stavanger, Institutt for samfunnsøkonomi

Biografi

I hold a Ph.D. in combinatorial optimization from the University of Oslo, Centre of Mathematics for Applications. Currently I am working with problems in covariance structure analysis; structural equation modeling, and simulation of non-normal multivariate data. 

I am also interested in education, and do research on the flipped classroom in higher education, as well as statistical analysis for the Norwegian Reading Centre. 

Publikasjoner

Walgermo, Bente R.; Foldnes, Njål, Uppstad, Per Henning & Solheim, Oddny Judith (2018)

Developmental Dynamics of Early Reading Skill, Literacy Interest and Reader's Self-Concept Within the First Year of Formal Schooling

Reading and writing, 31(6), s. 1379- 1399. Doi: 10.1007/s11145-018-9843-8

Strand, Olaug; Wagner, Åse Kari H. & Foldnes, Njål (2017)

Flerspråklige elevers leseresultater

Gabrielsen, Egil (red.). Klar framgang! Leseferdighet på 4. og 5. trinn i et femtenårsperspektiv

Steen-Utheim, Anna Therese & Foldnes, Njål (2017)

A qualitative investigation of student engagement in a flipped classroom

Teaching in Higher Education Doi: 10.1080/13562517.2017.1379481

Foldnes, Njål & Grønneberg, Steffen (2017)

Approximating Test Statistics Using Eigenvalue Block Averaging

Structural Equation Modeling Doi: 10.1080/10705511.2017.1373021

Foldnes, Njål & Grønneberg, Steffen (2017)

The asymptotic covariance matrix and its use in simulation studies

Structural Equation Modeling, 24(6), s. 881- 896. Doi: 10.1080/10705511.2017.1341320

Foldnes, Njål (2017)

The impact of class attendance on student learning in a flipped classroom

Nordic Journal of Digital Literacy, 12(1-2), s. 8- 18. Doi: 10.18261/issn.1891-943x-2017-01-02-02

We investigate the relationship between class attendance and academic achievement in a flipped classroom that was designed to foster social learning in fixed groups. Controlling for initial mathematical skill and attitudes, we found a substantial effect of class attendance on student achievement. Increasing class attendance by one standard deviation was associated with an increase in mathematics performance of 0.28 standard deviations. Neither attitudes nor initial mathematical skill predicted class attendance. We conclude that availability of online videos does not eliminate the need for carefully designed in-class sessions in order to maximise student learning. Communicating this finding may help reduce absenteeism in the flipped classroom.

Grønneberg, Steffen & Foldnes, Njål (2017)

Covariance Model Simulation Using Regular Vines

Psychometrika, 82(4), s. 1035- 1051. Doi: 10.1007/s11336-017-9569-6

We propose a new and flexible simulation method for non-normal data with user-specified marginal distributions, covariance matrix and certain bivariate dependencies. The VITA (VIne To Anything) method is based on regular vines and generalizes the NORTA (NORmal To Anything) method. Fundamental theoretical properties of the VITA method are deduced. Two illustrations demonstrate the flexibility and usefulness of VITA in the context of structural equation models. R code for the implementation is provided.

Foldnes, Njål & Olsson, Ulf H. (2016)

A simple simulation technique for non-normal data with pre-specified skewness, kurtosis and covariance matrix

Multivariate Behavioral Research, 51(2-3), s. 207- 219. Doi: 10.1080/00273171.2015.1133274

Foldnes, Njål (2016)

The flipped classroom and cooperative learning: Evidence from a randomised experiment

Active Learning in Higher Education, 17(1), s. 39- 49. Doi: 10.1177/1469787415616726

This article describes a study which compares the effectiveness of the flipped classroom relative to the traditional lecturebased classroom.We investigated two implementations of the flipped classroom. The first implementation did not actively encourage cooperative learning, with students progressing through the course at their own pace. With this implementation student examination scores did not differ between the lecture classes and the flipped classroom. The second implementation was organised with cooperative learning activities. In a randomised control-group pretest-posttest experiment student scores on a post-test and on the final examination were significantly higher for the flipped classroom group than for the control group receiving traditional lectures. This demonstrates that the classroom flip, if properly implemented with cooperative learning, can lead to increased academic performance.

Foldnes, Njål & Olsson, Ulf (2015)

Correcting too much or too little? The performance of three chi-square corrections

Multivariate Behavioral Research, 50(5), s. 533- 543. Doi: 10.1080/00273171.2015.1036964

Foldnes, Njål & Grønneberg, Steffen (2015)

How general is the Vale-Maurelli simulation approach?

Psychometrika, 80(4), s. 1066- 1083. Doi: 10.1007/s11336-014-9414-0

Foldnes, Njål & Hagtvet, Knut Arne (2014)

The Choice of Product Indicators in Latent Variable Interaction Models: Post Hoc Analyses

Psychological methods, 19(3), s. 444- 457. Doi: 10.1037/a0035728

Foldnes, Njål; Foss, Tron & Olsson, Ulf H. (2012)

Residuals and the Residual-Based Statistic for Testing Goodness of Fit of Structural Equation Models

Journal of educational and behavioral statistics, 37(3), s. 367- 386. Doi: 10.3102/1076998611411920

Foldnes, Njål; Olsson, Ulf H. & Foss, Tron (2012)

The effect of kurtosis on the power of two test statistics in covariance structure analysis

British Journal of Mathematical & Statistical Psychology, 65(1), s. 1- 18. Doi: 10.1111/j.2044-8317.2010.02010.x

Dahl, Geir & Foldnes, Njål (2006)

LP based heuristics for the multiple knapsack problem with assignment restrictions

Annals of Operations Research, 146(1), s. 91- 104.

Dahl, Geir; Foldnes, Njål & Gouveia, Luis (2004)

A note on hop-constrained walk polytopes

Operations Research Letters, 32, s. 345- 349.

Dahl, Geir & Foldnes, Njål (2003)

Complete description of a class of knapsack polytopes

Operations Research Letters, 31, s. 335- 340.

Foldnes, Njål; Grønneberg, Steffen & Hermansen, Gudmund Horn (2018)

Statistikk og Dataanalyse

[Textbook]. Cappelen Damm Akademisk.

Strand, Olaug; Wagner, Åse Kari H. & Foldnes, Njål (2017)

Flerspråklige elevers leseresultater i PIRLS 2016

[Academic lecture]. PIRLS konferanse.

Wagner, Åse Kari H.; Foldnes, Njål, Lundetræ, Kjersti, Solheim, Oddny Judith & Uppstad, Per Henning (2017)

På sporet - effekt av tidlig innsats for andrespråkselever med risiko for å utvikle lese- og skrivevansker

[Academic lecture]. SkrivLes! 2017 Nordisk forskerkonferanse om lesing og skriving.

McTigue, Erin; Solheim, Oddny Judith, Walgermo, Bente R., Foldnes, Njål & Frijters, Jan c (2017)

Measuring multiple dimensions of early literacy motivation through self-report at school entry

[Academic lecture]. 17th Biennial EARLI Conference for research on learning and instruction.

Uppstad, Per Henning; Foldnes, Njål, Lundetræ, Kjersti, Solheim, Oddny Judith & Wagner, Åse Kari H. (2016)

Effect of early intervention for minority children at-risk for reading difficulties

[Academic lecture]. National Network series on Perspectives on Developmental Deficits.

Foldnes, Njål & Hagtvet, Knut Arne (2014)

The Choice of Product indicators in latent variable interaction models

[Academic lecture]. Two-Day Research SEminar.

Foldnes, Njål (2010)

The effect of kurtosis on the power of two test statistics

[Academic lecture]. SEM working group annual meeting.

Foldnes, Njål (2008)

Testing Structural Equation Models: The effect of Kurtosis

[Academic lecture]. 7th International Conference on Social Science Methodology.

Dahl, Geir; Flatberg, Truls, Foldnes, Njål & Gouveia, Luis (2006)

The Jump Formulation for the Hop-Constrained Minimum Spanning Tree Problem

[Academic lecture]. The 8th INFORMS Telecommunications Conference.

Foldnes, Njål; Mørken, Knut Martin & Vistnes, Arnt Inge (2005)

En ny verden: Datamaskinen, beregninger og realfagsundervisning

[Popular scientific article]. UNIPED (Tromsø), 28(3), s. 36- 43.

Dahl, Geir & Foldnes, Njål (2003)

On hop-constrained walk polytopes

[Academic lecture]. 18th International Symposium on Mathematical Programming.

Dahl, Geir & Foldnes, Njål (2003)

A randomized algorithm for the multiple knapsack problem with assignment restrictions

[Academic lecture]. Int. network optimization conf..

Dahl, Geir & Foldnes, Njål (2002)

Complexity of certain multiple knapsack problems

[Academic lecture]. Nordic Mathematical Prog. Society Conference.

Dahl, Geir & Foldnes, Njål (2002)

Polyhedral Properties of certain 0/1 Knapsack Polytopes

[Academic lecture]. IFORS 2002.

Akademisk grad
År Akademisk institusjon Grad
2004 University of Oslo Ph.D Dr. Scient.
2004 University of Oslo Ph.D Dr. Scient.
Arbeidserfaring
År Arbeidsgiver Tittel
2006 - Present BI Norwegian Business School Associate professor