What is the origin of 'sleep tight'?

Read moreOne of the mysteries of the English language finally explained.

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The quantitative relation between two amounts showing the number of times one value contains or is contained within the other.

*‘the ratio of men's jobs to women's is 8 to 1’*-
*‘The simplest model assumes the same ratio for all branches in a phylogeny.’* -
*‘Measuring the isotopic ratios on Mars will provide clues about possible biological activity.’* -
*‘We estimated hazard ratios by using Cox regression with age as the time metric.’* -
*‘Adjusted odds ratios were calculated by logistic regression, whereas adjusted risk ratios were calculated by generalized linear modeling.’* -
*‘Higher male mortality leads to decreasing male-female sex ratios as the population segment gets older.’* -
*‘Aspect ratio is the ratio between the width of the tire and the height of its side wall.’* -
*‘It is easier to see what is happening if we plot the ratios on a graph.’* -
*‘The control cross (uninfected male x uninfected female) yielded normal family sizes and female-biased sex ratios.’* -
*‘The bank's capital adequacy ratio remained at 11.72 per cent.’* -
*‘The ratio varied in the range of 0 to 5.’* -
*‘Multivariate logistic regression analysis was used to calculate the adjusted odds ratio of failure rates.’* -
*‘In contrast, the Argentine central bank's reserve ratio ranged between 193 percent and 82 percent in 2001.’* -
*‘Twenty repeated scans were averaged to improve the signal-to-noise ratio in each recorded image.’* -
*‘The total chlorophyll/carotenoid molar ratio greatly decreased.’* -
*‘The banks' non-performing loan ratio reached a record high of 8.09 percent in April 2002.’* -
*‘We next estimated the likelihood of the data under a unique ratio among all lineages.’* -
*‘At MIT you learn about things like bandwidth, power, and signal-to-noise ratios.’* -
*‘We therefore estimated standardised hazard ratios.’* -
*‘We have reported all standardised mortality ratios as ratios rather than percentages.’* -
*‘In addition, nitrogen metabolism increases the molar ratio of amino nitrogen released to filial tissues.’* -
*‘A ratio higher than 1 in a product group is connected with a comparative advantage.’*

View synonyms**proportion**, comparative extent, comparative number, quantitative relation, correlation, relationship, correspondence, balance-

Mid 17th century: from Latin, literally ‘reckoning’, from rat- ‘reckoned’, from the verb reri.