Correction to: Methodology and Computing in Applied Probability (2021) 23:1.

https://doi.org/10.1007/s11009-020-09833-7 https://doi.org/10.1007/s11009-020-09836-4 https://doi.org/10.1007/s11009-020-09838-2 https://doi.org/10.1007/s11009-020-09837-3

The Publisher regrets an error by classifying an incorrect article type for the below-mentioned articles. These articles should be classified as “Original Articles”.

The original articles have been corrected.