placestats

Political stability vs. Women's political empowerment

Holds up after adjusting for income

Across 168 countries, Political stability and Women's political empowerment rise and fall together at r = +0.54 (on a scale from −1 to +1, where 0 means no link). Comparing only countries with similar income (GDP per person) shrinks it to +0.37 (q = 0.0055, allowing for the many pairs tested). Much of the first figure is that both measures rise with national income, but a weak positive link remains.

Comparing countries across the middle half of women's political empowerment, 0.625 to 0.873 points, political stability is better by 0.672 points at the top of that range than the bottom. Comparing only countries with similar national income, the gap is 0.396 points.

Link before adjusting (r)+0.541p = 3.8e-14 · 168 countries
After adjusting for national income+0.371p = 7.9e-7 · likely range [+0.23, +0.50]
p, allowing for regions0.009standard error 0.097 · 7 regions
Check for luck (q)0.006across 12,497 pairs

How to read these.r runs from −1 (one goes up as the other goes down) to +1 (they rise together), and 0 means no link. Adjusting for national income means comparing countries with the same GDP per person, so differences in wealth can’t explain the link. Income is used in percentage terms, since an extra $1,000 means more to a poor country than to a rich one. p is how likely a link this strong would be if there were really none. Below 0.05 means it is unlikely to be chance. Very small values are written in short form: 1.1e-32 means a decimal point followed by 31 zeros and then 11, so very close to zero. The likely range is where the true figure probably lies, and a range that crosses zero means the link could easily be chance. Countries in the same region tend to resemble each other, so the third figure allows for that, which gives a fairer p. The standard error is the typical size of the error in r. Finally, testing this many pairs means some will look strong by luck alone. A q below 0.05 means this link is unlikely to be one of those.

Political stability · index (approx. -2.5 to 2.5)link with income +0.56 · moderate
Women's political empowerment · index (0-1)link with income +0.54 · moderate

“Link with income” is how closely each measure tracks GDP per person across countries, from −1 to +1.

Every country as a dot

Political stability · index (approx. -2.5 to 2.5) →Women's political empowerment · index (0-1) →-2.491.350.0280.954Afghanistan: -2.21 index (approx. -2.5 to 2.5), 0.028 index (0-1)Angola: -0.574 index (approx. -2.5 to 2.5), 0.77 index (0-1)Albania: 0.0205 index (approx. -2.5 to 2.5), 0.893 index (0-1)United Arab Emirates: 0.789 index (approx. -2.5 to 2.5), 0.614 index (0-1)Argentina: -0.17 index (approx. -2.5 to 2.5), 0.832 index (0-1)Armenia: -0.723 index (approx. -2.5 to 2.5), 0.875 index (0-1)Australia: 0.793 index (approx. -2.5 to 2.5), 0.906 index (0-1)Austria: 0.492 index (approx. -2.5 to 2.5), 0.905 index (0-1)Azerbaijan: -0.14 index (approx. -2.5 to 2.5), 0.649 index (0-1)Burundi: -1.38 index (approx. -2.5 to 2.5), 0.653 index (0-1)Belgium: 0.121 index (approx. -2.5 to 2.5), 0.952 index (0-1)Benin: -0.403 index (approx. -2.5 to 2.5), 0.882 index (0-1)Burkina Faso: -1.91 index (approx. -2.5 to 2.5), 0.602 index (0-1)Bangladesh: -1.46 index (approx. -2.5 to 2.5), 0.537 index (0-1)Bulgaria: 0.0399 index (approx. -2.5 to 2.5), 0.907 index (0-1)Bahrain: -0.276 index (approx. -2.5 to 2.5), 0.568 index (0-1)Bosnia and Herzegovina: -0.501 index (approx. -2.5 to 2.5), 0.821 index (0-1)Belarus: -0.377 index (approx. -2.5 to 2.5), 0.657 index (0-1)Bolivia: -0.546 index (approx. -2.5 to 2.5), 0.84 index (0-1)Brazil: -0.521 index (approx. -2.5 to 2.5), 0.818 index (0-1)Barbados: 1.27 index (approx. -2.5 to 2.5), 0.895 index (0-1)Bhutan: 1.35 index (approx. -2.5 to 2.5), 0.675 index (0-1)Botswana: 1.03 index (approx. -2.5 to 2.5), 0.699 index (0-1)Central African Republic: -1.83 index (approx. -2.5 to 2.5), 0.556 index (0-1)Canada: 0.598 index (approx. -2.5 to 2.5), 0.872 index (0-1)Switzerland: 0.981 index (approx. -2.5 to 2.5), 0.93 index (0-1)Chile: 0.121 index (approx. -2.5 to 2.5), 0.913 index (0-1)China: -0.153 index (approx. -2.5 to 2.5), 0.587 index (0-1)Cote d'Ivoire: -0.844 index (approx. -2.5 to 2.5), 0.696 index (0-1)Cameroon: -1.56 index (approx. -2.5 to 2.5), 0.76 index (0-1)Congo, Dem. Rep.: -2.12 index (approx. -2.5 to 2.5), 0.55 index (0-1)Congo, Rep.: -0.258 index (approx. -2.5 to 2.5), 0.466 index (0-1)Colombia: -0.971 index (approx. -2.5 to 2.5), 0.777 index (0-1)Comoros: -0.221 index (approx. -2.5 to 2.5), 0.556 index (0-1)Cabo Verde: 0.77 index (approx. -2.5 to 2.5), 0.855 index (0-1)Costa Rica: 1.18 index (approx. -2.5 to 2.5), 0.907 index (0-1)Cyprus: 0.386 index (approx. -2.5 to 2.5), 0.856 index (0-1)Czechia: 0.972 index (approx. -2.5 to 2.5), 0.93 index (0-1)Germany: 0.124 index (approx. -2.5 to 2.5), 0.942 index (0-1)Djibouti: -0.556 index (approx. -2.5 to 2.5), 0.584 index (0-1)Denmark: 0.769 index (approx. -2.5 to 2.5), 0.954 index (0-1)Dominican Republic: 0.589 index (approx. -2.5 to 2.5), 0.825 index (0-1)Algeria: -0.694 index (approx. -2.5 to 2.5), 0.625 index (0-1)Ecuador: -0.721 index (approx. -2.5 to 2.5), 0.79 index (0-1)Egypt, Arab Rep.: -0.978 index (approx. -2.5 to 2.5), 0.547 index (0-1)Spain: -0.00299 index (approx. -2.5 to 2.5), 0.943 index (0-1)Estonia: 0.7 index (approx. -2.5 to 2.5), 0.941 index (0-1)Ethiopia: -1.88 index (approx. -2.5 to 2.5), 0.691 index (0-1)Finland: 0.833 index (approx. -2.5 to 2.5), 0.932 index (0-1)Fiji: 0.698 index (approx. -2.5 to 2.5), 0.644 index (0-1)France: -0.241 index (approx. -2.5 to 2.5), 0.929 index (0-1)Gabon: -0.277 index (approx. -2.5 to 2.5), 0.798 index (0-1)United Kingdom: 0.258 index (approx. -2.5 to 2.5), 0.838 index (0-1)Georgia: -0.613 index (approx. -2.5 to 2.5), 0.816 index (0-1)Ghana: 0.0115 index (approx. -2.5 to 2.5), 0.767 index (0-1)Guinea: -1.04 index (approx. -2.5 to 2.5), 0.532 index (0-1)Gambia, The: -0.018 index (approx. -2.5 to 2.5), 0.813 index (0-1)Guinea-Bissau: -0.618 index (approx. -2.5 to 2.5), 0.502 index (0-1)Equatorial Guinea: -0.141 index (approx. -2.5 to 2.5), 0.449 index (0-1)Greece: 0.139 index (approx. -2.5 to 2.5), 0.896 index (0-1)Guatemala: -0.21 index (approx. -2.5 to 2.5), 0.722 index (0-1)Guyana: 0.216 index (approx. -2.5 to 2.5), 0.81 index (0-1)Hong Kong SAR, China: 0.631 index (approx. -2.5 to 2.5), 0.801 index (0-1)Honduras: -0.567 index (approx. -2.5 to 2.5), 0.789 index (0-1)Croatia: 0.581 index (approx. -2.5 to 2.5), 0.913 index (0-1)Haiti: -1.2 index (approx. -2.5 to 2.5), 0.403 index (0-1)Hungary: 0.436 index (approx. -2.5 to 2.5), 0.818 index (0-1)Indonesia: -0.609 index (approx. -2.5 to 2.5), 0.726 index (0-1)India: -0.786 index (approx. -2.5 to 2.5), 0.658 index (0-1)Ireland: 0.71 index (approx. -2.5 to 2.5), 0.927 index (0-1)Iran, Islamic Rep.: -1.58 index (approx. -2.5 to 2.5), 0.32 index (0-1)Iraq: -2.06 index (approx. -2.5 to 2.5), 0.555 index (0-1)Iceland: 1.21 index (approx. -2.5 to 2.5), 0.883 index (0-1)Israel: -1.04 index (approx. -2.5 to 2.5), 0.862 index (0-1)Italy: 0.309 index (approx. -2.5 to 2.5), 0.929 index (0-1)Jamaica: 0.477 index (approx. -2.5 to 2.5), 0.929 index (0-1)Jordan: -0.35 index (approx. -2.5 to 2.5), 0.669 index (0-1)Japan: 1.13 index (approx. -2.5 to 2.5), 0.844 index (0-1)Kazakhstan: -0.283 index (approx. -2.5 to 2.5), 0.682 index (0-1)Kenya: -1.36 index (approx. -2.5 to 2.5), 0.804 index (0-1)Kyrgyz Republic: -0.505 index (approx. -2.5 to 2.5), 0.733 index (0-1)Cambodia: 0.128 index (approx. -2.5 to 2.5), 0.534 index (0-1)Korea, Rep.: 0.639 index (approx. -2.5 to 2.5), 0.878 index (0-1)Kuwait: 0.294 index (approx. -2.5 to 2.5), 0.357 index (0-1)Lao PDR: 0.558 index (approx. -2.5 to 2.5), 0.508 index (0-1)Lebanon: -1.39 index (approx. -2.5 to 2.5), 0.608 index (0-1)Liberia: -0.229 index (approx. -2.5 to 2.5), 0.823 index (0-1)Libya: -1.9 index (approx. -2.5 to 2.5), 0.412 index (0-1)Sri Lanka: -0.35 index (approx. -2.5 to 2.5), 0.742 index (0-1)Lesotho: -0.259 index (approx. -2.5 to 2.5), 0.809 index (0-1)Lithuania: 0.939 index (approx. -2.5 to 2.5), 0.926 index (0-1)Luxembourg: 1.07 index (approx. -2.5 to 2.5), 0.896 index (0-1)Latvia: 0.62 index (approx. -2.5 to 2.5), 0.95 index (0-1)Morocco: -0.441 index (approx. -2.5 to 2.5), 0.712 index (0-1)Moldova: -0.345 index (approx. -2.5 to 2.5), 0.898 index (0-1)Madagascar: -0.481 index (approx. -2.5 to 2.5), 0.704 index (0-1)Maldives: -0.0545 index (approx. -2.5 to 2.5), 0.532 index (0-1)Mexico: -0.715 index (approx. -2.5 to 2.5), 0.801 index (0-1)North Macedonia: 0.156 index (approx. -2.5 to 2.5), 0.824 index (0-1)Mali: -2.49 index (approx. -2.5 to 2.5), 0.706 index (0-1)Malta: 0.805 index (approx. -2.5 to 2.5), 0.917 index (0-1)Myanmar: -2.09 index (approx. -2.5 to 2.5), 0.33 index (0-1)Montenegro: 0.332 index (approx. -2.5 to 2.5), 0.866 index (0-1)Mongolia: 0.42 index (approx. -2.5 to 2.5), 0.806 index (0-1)Mozambique: -1.76 index (approx. -2.5 to 2.5), 0.725 index (0-1)Mauritania: -0.56 index (approx. -2.5 to 2.5), 0.541 index (0-1)Mauritius: 0.79 index (approx. -2.5 to 2.5), 0.814 index (0-1)Malawi: -0.38 index (approx. -2.5 to 2.5), 0.755 index (0-1)Malaysia: 0.385 index (approx. -2.5 to 2.5), 0.772 index (0-1)Namibia: 0.547 index (approx. -2.5 to 2.5), 0.855 index (0-1)Niger: -1.76 index (approx. -2.5 to 2.5), 0.709 index (0-1)Nigeria: -2 index (approx. -2.5 to 2.5), 0.732 index (0-1)Nicaragua: -0.0694 index (approx. -2.5 to 2.5), 0.531 index (0-1)Netherlands: 0.428 index (approx. -2.5 to 2.5), 0.903 index (0-1)Norway: 0.903 index (approx. -2.5 to 2.5), 0.926 index (0-1)Nepal: -0.415 index (approx. -2.5 to 2.5), 0.792 index (0-1)New Zealand: 1.15 index (approx. -2.5 to 2.5), 0.937 index (0-1)Oman: 0.627 index (approx. -2.5 to 2.5), 0.357 index (0-1)Pakistan: -2.06 index (approx. -2.5 to 2.5), 0.524 index (0-1)Panama: 0.265 index (approx. -2.5 to 2.5), 0.742 index (0-1)Peru: -0.654 index (approx. -2.5 to 2.5), 0.775 index (0-1)Philippines: -0.774 index (approx. -2.5 to 2.5), 0.81 index (0-1)Papua New Guinea: -0.654 index (approx. -2.5 to 2.5), 0.48 index (0-1)Poland: 0.499 index (approx. -2.5 to 2.5), 0.878 index (0-1)Portugal: 0.537 index (approx. -2.5 to 2.5), 0.811 index (0-1)Paraguay: -0.0738 index (approx. -2.5 to 2.5), 0.669 index (0-1)Qatar: 0.951 index (approx. -2.5 to 2.5), 0.388 index (0-1)Romania: 0.159 index (approx. -2.5 to 2.5), 0.872 index (0-1)Russian Federation: -0.903 index (approx. -2.5 to 2.5), 0.546 index (0-1)Rwanda: -0.0437 index (approx. -2.5 to 2.5), 0.626 index (0-1)Saudi Arabia: -0.0482 index (approx. -2.5 to 2.5), 0.347 index (0-1)Sudan: -2.02 index (approx. -2.5 to 2.5), 0.219 index (0-1)Senegal: -0.229 index (approx. -2.5 to 2.5), 0.855 index (0-1)Singapore: 1.23 index (approx. -2.5 to 2.5), 0.785 index (0-1)Solomon Islands: 0.75 index (approx. -2.5 to 2.5), 0.675 index (0-1)Sierra Leone: -0.45 index (approx. -2.5 to 2.5), 0.801 index (0-1)El Salvador: 0.00613 index (approx. -2.5 to 2.5), 0.587 index (0-1)Somalia, Fed. Rep.: -2.26 index (approx. -2.5 to 2.5), 0.337 index (0-1)Serbia: -0.169 index (approx. -2.5 to 2.5), 0.864 index (0-1)Sao Tome and Principe: 0.489 index (approx. -2.5 to 2.5), 0.843 index (0-1)Suriname: 0.478 index (approx. -2.5 to 2.5), 0.877 index (0-1)Slovak Republic: 0.634 index (approx. -2.5 to 2.5), 0.878 index (0-1)Slovenia: 0.721 index (approx. -2.5 to 2.5), 0.94 index (0-1)Sweden: 0.604 index (approx. -2.5 to 2.5), 0.923 index (0-1)Eswatini: -0.733 index (approx. -2.5 to 2.5), 0.391 index (0-1)Seychelles: 0.916 index (approx. -2.5 to 2.5), 0.908 index (0-1)Syrian Arab Republic: -2.37 index (approx. -2.5 to 2.5), 0.29 index (0-1)Chad: -1.78 index (approx. -2.5 to 2.5), 0.625 index (0-1)Togo: -0.809 index (approx. -2.5 to 2.5), 0.692 index (0-1)Thailand: -0.683 index (approx. -2.5 to 2.5), 0.688 index (0-1)Tajikistan: -0.276 index (approx. -2.5 to 2.5), 0.431 index (0-1)Turkmenistan: 0.246 index (approx. -2.5 to 2.5), 0.437 index (0-1)Timor-Leste: 0.526 index (approx. -2.5 to 2.5), 0.768 index (0-1)Trinidad and Tobago: 0.36 index (approx. -2.5 to 2.5), 0.874 index (0-1)Tunisia: -0.925 index (approx. -2.5 to 2.5), 0.765 index (0-1)Turkiye: -0.971 index (approx. -2.5 to 2.5), 0.558 index (0-1)Tanzania: -0.39 index (approx. -2.5 to 2.5), 0.834 index (0-1)Uganda: -1.02 index (approx. -2.5 to 2.5), 0.636 index (0-1)Ukraine: -0.432 index (approx. -2.5 to 2.5), 0.888 index (0-1)Uruguay: 1.28 index (approx. -2.5 to 2.5), 0.875 index (0-1)United States: -0.0951 index (approx. -2.5 to 2.5), 0.829 index (0-1)Uzbekistan: -0.0267 index (approx. -2.5 to 2.5), 0.643 index (0-1)Viet Nam: 0.00567 index (approx. -2.5 to 2.5), 0.808 index (0-1)Vanuatu: 0.96 index (approx. -2.5 to 2.5), 0.715 index (0-1)Kosovo: -0.322 index (approx. -2.5 to 2.5), 0.771 index (0-1)South Africa: -0.617 index (approx. -2.5 to 2.5), 0.83 index (0-1)Zambia: -0.101 index (approx. -2.5 to 2.5), 0.791 index (0-1)Zimbabwe: -1.02 index (approx. -2.5 to 2.5), 0.727 index (0-1)AFGBRBCRIKWTMLIMOZNGANZLOMNQATSDNSYR

best-fit line line after adjusting

Four ways to measure the link

MethodrpCountries
Standard (Pearson), not adjusted+0.5413.8e-14168
By rank (Spearman), not adjusted+0.5574.6e-15168
Standard (Pearson), adjusted for national income+0.3717.9e-7168
By rank (Spearman), adjusted for national income+0.3251.8e-5168

The rank version uses only each country’s place in line, from lowest to highest, so a few extreme countries count for less. The adjusted and unadjusted versions use the same 168 countries: those that report both measures and GDP per person. So the gap between them comes from the adjustment, not from a change in which countries are counted. Drop in the size of r after adjusting: +0.170 (a minus sign means it grew).

How solid is it?

Leaving out one country at a time, r ranges from +0.350 (without IRN) to +0.390 (without OMN). The bar above shows that range on a scale from −1 to +1, with the solid line at the full result. The single country that moves r most: IRN (-0.021).

Within each region

Countries are not separate, unrelated cases, and neighbors share a lot. A link that holds inside each region is far more believable than one that shows up only when comparing regions.

nr
East Asia & Pacific21+0.53
Europe & Central Asia49+0.26
Latin America & Caribbean23+0.28
Middle East, North Africa, Afghanistan & Pakistan21+0.10
Sub-Saharan Africa46+0.37

By income third

If the link shows up only in the richest third of countries, it is a feature of rich countries, not a general pattern.

nr
Poorest third56+0.42
Middle third56+0.37
Richest third56+0.30

By largest religious group

Countries grouped by a label they share, such as main religion, rather than by a number. Groups of fewer than twelve countries are not shown. These groups differ in income, region and history all at once. So a gap between them is a place to start asking questions, not an answer.

nr
Christians99+0.25
Muslims48+0.30

By last european coloniser

Countries grouped by a label they share, such as main religion, rather than by a number. Groups of fewer than twelve countries are not shown. These groups differ in income, region and history all at once. So a gap between them is a place to start asking questions, not an answer.

nr
France25+0.12
Never a European colony21+0.39
Spain19-0.11
United Kingdom49+0.49

Without outliers (countries far outside the middle half of countries on either measure, by more than one and a half times the width of that middle half): r = +0.358 after dropping 3 countries.

Two series, one country

Both measures over the years for one country you pick. The two charts are stacked so they share only the years along the bottom.

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Over time, within countries

Everything above compares countries with each other at one moment. This section compares each country only with itself over 29years. So a link here can’t come from anything about a country that stays the same, such as its history, geography, institutions or culture.

The link also shows up within countries over time (r = +0.195). It holds even when looking only at changes from one year to the next (r = +0.092). This is the strongest kind of evidence available here: it holds when each country is compared only with itself, and it is not just a product of shared trends.

Across countries (adjusted)+0.371for comparison
Within countries+0.174each country vs itself
…and vs the same year elsewhere+0.195q = 0.014 · 175 countries
Year-on-year changes+0.092q = 0.007
Read with care.
  • Almost all of this indicator's variation is between countries, not within them, so the within-country estimate rests on a small part of the data.

4,498 country-years (one country in one year), 175 countries, 1996–2024, about 26 years each on average. Share of the variation that happens within countries over time: 7% for Political stability, 13% for Women's political empowerment. The margins of error allow for each country appearing many times, and for each year’s value being close to the year before.

Year-to-year changes are a cautious test, not a final answer. Looking only at changes from one year to the next removes each country’s own trends. But it also makes measurement mistakes louder, which pulls the results toward zero. A near-zero result here is weak evidence of no link, not proof.

With one measure years behind the other

0.30−0.3-100+10years Women's political empowerment trails Political stability →lag -10: r = 0.185 (n = 4,114)lag -9: r = 0.187 (n = 4,121)lag -8: r = 0.193 (n = 4,291)lag -7: r = 0.192 (n = 4,298)lag -6: r = 0.203 (n = 4,469)lag -5: r = 0.200 (n = 4,476)lag -4: r = 0.200 (n = 4,480)lag -3: r = 0.197 (n = 4,485)lag -2: r = 0.195 (n = 4,490)lag -1: r = 0.194 (n = 4,493)lag +0: r = 0.195 (n = 4,498)lag +1: r = 0.181 (n = 4,503)lag +2: r = 0.148 (n = 4,331)lag +3: r = 0.127 (n = 4,161)lag +4: r = 0.086 (n = 3,990)lag +5: r = 0.070 (n = 3,817)lag +6: r = 0.042 (n = 3,646)lag +7: r = 0.034 (n = 3,473)lag +8: r = 0.016 (n = 3,302)lag +9: r = 0.011 (n = 3,128)lag +10: r = 0.014 (n = 2,955)

Same year (lag 0): +0.195. A peak away from zero does not show which comes first. These series change slowly — this year’s value is close to last year’s. That makes the curve smooth and nearly symmetric, whatever produced the data. Even a sharp peak at one lag (a gap of some years) would not prove that one measure changes the other.

The data


index (approx. -2.5 to 2.5)

index (0-1)
Years
Bhutan BTN1.350.6752024, 2025
Uruguay URY1.280.8752024, 2025
Barbados BRB1.270.8952024, 2025
Singapore SGP1.230.7852024, 2025
Iceland ISL1.210.8832024, 2025
Costa Rica CRI1.180.9072024, 2025
New Zealand NZL1.150.9372024, 2025
Japan JPN1.130.8442024, 2025
Luxembourg LUX1.070.8962024, 2025
Botswana BWA1.030.6992024, 2025
Switzerland CHE0.9810.932024, 2025
Czechia CZE0.9720.932024, 2025
Vanuatu VUT0.960.7152024, 2025
Qatar QAT0.9510.3882024, 2025
Lithuania LTU0.9390.9262024, 2025

Kaufmann, D. and A. Kraay, Worldwide Governance Indicators, World Bank
Coppedge, M. et al., V-Dem Dataset, Varieties of Democracy (V-Dem) Project

Sources

Political stability

Political Stability and Absence of Violence/Terrorism (estimate)

World Bank · CC BY 4.0 · updated annual

Women's political empowerment

Women's political empowerment index

V-Dem Institute, University of Gothenburg · via Our World in Data · CC BY 4.0 · updated annual

Women's civil liberties, their part in civic groups, and their political representation. It is built from its own set of questions, not from the parts of the democracy indices, so it is not tagged as measuring the same thing. Still, read its links with them carefully. Whether women take part in politics is partly built into whether real political participation exists at all. So a strong link with general democracy measures is closer to definitional (true by how the terms are defined) than to a finding about the world.

How this was computed

Data used: most recent value in 2010-2025; values come from 2024–2025. To adjust for income, each measure is first predicted from GDP per person (in percentage terms, on a log scale) with a straight-line fit. Only what is left over is then compared. This is called a partial correlation. The line is drawn the standard way (ordinary least squares), which picks the line that comes closest to all the countries at once. The error margins allow for countries in the same region resembling each other, using 7 World Bank regions. The q-value corrects for testing all 12,497 pairs at once, using the Benjamini–Hochberg method. Underlying data last updated DYB 2024. How the country data works · explore Political stability and Women's political empowerment

This page shows that two measures go together. It does not show that Political stability changes Women's political empowerment, or the reverse. These figures also describe countries, not individual people. See the ecological fallacy.

More links with Political stability or Women's political empowerment