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NET INCOME (LOSS) PER SHARE | 12 Months Ended
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Dec. 31, 2018
NET INCOME (LOSS) PER SHARE |
NET INCOME (LOSS) PER SHARE | 19. NET INCOME (LOSS) PER SHARE Basic and diluted net income (loss) per share for each of the periods presented were calculated as follows:
|  | Years ended December 31,
|  | 2016 |  | 2017 |  | 2018
Numerator: |  |  |  |  |  |
Net income (loss) attributable to ordinary shareholders of RYB Education, Inc. for computing basic and diluted net income (loss) per ordinary share |  | 6,505 |  | 7,115 |  | (1,789)
Denominator: |  |  |  |  |  |
Weighted average ordinary shares outstanding used in computing basic net income (loss) per ordinary share |  | 23,163,801 |  | 24,735,445 |  | 29,213,801
Effect of dilutive securities |  |  |  |  |  |
Plus incremental weighted average ordinary shares from assumed conversions of options and nonvested shares using the treasury stock method |  | 1,518,724 |  | 1,831,212 |  | —
Weighted average ordinary shares outstanding used in computing diluted net income per ordinary share |  | 24,682,525 |  | 26,566,657 |  | 29,213,801
Net income (loss) per ordinary share-basic |  | 0.28 |  | 0.29 |  | (0.06)
Net income (loss) per ordinary share-diluted |  | 0.26 |  | 0.27 |  | (0.06)
For the year ended December 31, 2018, the following shares outstanding were excluded from the calculation of diluted net loss per ordinary share, as their inclusion would have been anti-dilutive for the periods presented.
|  | As of December 31,
|  | 2018
Options and nonvested shares |  | 4,275,011

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