4. Earnings per Share

Basic earnings per common share amounts are calculated using the weighted average number of common shares outstanding for the period. Diluted earnings per common share amounts are calculated using the weighted average number of common shares outstanding plus the additional dilution for all potentially dilutive securities, such as nonvested restricted stock. During loss periods, diluted loss per share amounts are based on the weighted average number of common shares outstanding, because the inclusion of common stock equivalents would be antidilutive.

The dilutive effect of stock-based compensation arrangements is accounted for using the treasury stock method. The Company includes as assumed proceeds the amount of compensation cost attributed to future services and not yet recognized. For the twenty-six weeks ended August 3, 2019 and August 4, 2018, there were 135,000 and 118,000 shares of nonvested restricted stock, respectively, excluded from the calculation of diluted earnings per share because of antidilution. For the thirteen weeks ended August 3, 2019 and August 4, 2018, there were 143,000 and 127,000 shares of nonvested restricted stock, respectively, excluded from the calculation of diluted earnings per share because of antidilution.

The following table provides a reconciliation of the weighted average number of common shares outstanding used to calculate basic earnings per share to the weighted average number of common shares and common stock equivalents outstanding used in calculating diluted earnings per share for the twenty-six and thirteen week periods ended August 3, 2019 and August 4, 2018:


	Twenty-Six Weeks Ended
	August 3, 2019	August 4, 2018
Weighted average number of common shares outstanding	11,929,019	13,446,285
Incremental shares from assumed vesting of nonvested restricted stock	15,082	45,009
Weighted average number of common shares and common stock equivalents outstanding	11,944,101	13,491,294


	Thirteen Weeks Ended
	August 3, 2019	August 4, 2018
Weighted average number of common shares outstanding	11,881,896	13,314,470
Incremental shares from assumed vesting of nonvested restricted stock	—	36,851
Weighted average number of common shares and common stock equivalents outstanding	11,881,896	13,351,321