• An alternative model for EDM signatures

• Comparing the one-cutpoint and two-cutpoint models

• Sampling algorithm

• EDM locations

• Legislator ideal point estimates

Table 1: Estimated posterior mean and 95% CCI for leg- islator ideal points

Figure 1: Number of EDMs signed against estimated ideal points derived from the one- and two-cutpoint models

Figure 2: Support for Labour majority position on divisions among Labour MPs as a function of estimated ideal points

Figure 3: Implied policy shifts of EDMs sponsored by major party MPs

Figure 4: Precision of MP ideal point estimates versus estimated signing cost

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